Section 2528. Traffic Control
1. This section describes various materials, equipment, and procedures involved in traffic control during construction. The Contractor and the Contracting Authority have certain responsibilities, whether public traffic is allowed or is prohibited during construction. Apply Article 1107.09.
2. The contract may include an item for traffic control. In this case furnish, erect, operate, maintain, move, and remove all traffic control devices required by the contract documents.
3. The contract may indicate that traffic control is incidental. In this case the Contracting Authority will furnish all signs and traffic control devices, except pilot car and flaggers' signs, and all Type III barricades, and associated mounting devices. Furnish all other traffic control devices required. Erect, operate, maintain, move, and remove all traffic control devices. Signs and barricades to be furnished by the Contracting Authority will be made available at a nearby maintenance site. Return the signs and barricades when no longer needed. Contracting Authority signs and barricades damaged during construction activities by Contractor’s activities shall be replaced at no charge to the Contracting Authority.
4. The contract documents may specify orange mesh safety fence be used in conjunction with other traffic control devices as part of the project traffic control requirements. Use orange mesh safety fence meeting the requirements of Article 4188.03. Securely support the fence so it is in a vertical position without any sagging. Locate and place the safety fence supports so they are not a safety hazard.
5. Ensure all traffic control complies with the current edition of the MUTCD, Part 6 as adopted by the Department, unless modified by the contract documents.
6. Provide 10 calendar days advance notification of a pedestrian path closure to the Engineer.
B. Monitoring with Incident Response.
1. Provide 24 hour per day continuous monitoring of traffic control devices and incident response for emergency situations on projects during complex traffic situations as defined in the contract documents. Ensure a vehicle and operator traverses the project throughout the entire traffic control zone at all times, except for refueling and short rest breaks no greater than 15 minutes in duration.
2. Furnish this work according to the contract documents any time that signs, barriers, barricades, or other traffic control devices are in place during complex traffic situations.
3. Provide a vehicle and operator for this work as follows:
a. Equipment.
1) Meet the following requirements:
a) 3/4 ton pickup truck or another similar vehicle.
b) Contractor’s insignia on the doors of the vehicle.
c) Adequate weight and power and suitably equipped to move stalled automobiles, sport utility vehicles, or pickup trucks.
d) Equipped with an amber or yellow high intensity rotating, flashing, or oscillating warning light visible in all directions and a cellular telephone or similar type of mobile phone.
e) Capable of carrying traffic signs, tools, traffic control devices, and other necessary equipment.
2) When used on projects where more than one lane in one direction is maintained at all times, ensure this vehicle is also be equipped with a Type C arrow panel as described in Article 2528.03, F, mounted to be visible to traffic approaching from behind.
b. Operation.
1) Furnish an operator for the vehicle. Ensure the operator re-erects, repairs, or replaces defective devices immediately upon discovery.
2) Have the operator:
a) Be available to assist persons with vehicle problems and move automobiles, sport utility vehicles, pickup trucks and other obstructions to keep all travel lanes and shoulders available for public traffic.
b) Continue assistance to motorists and involvement with obstructions until they are no longer an impediment to traffic and further assistance can be provided safely by others.
c) Assist motorists or remove obstructions promptly and safely when a vehicle or anything else is obstructing a travel lane or shoulder intended to be clear.
d) Summon further assistance if needed.
e) Keep a report of any events that restrict the normal traffic flow during complex operations, including responses to emergency situations, on forms provided by the Engineer. Provide the Engineer with a copy of this report daily.
3) During anticipated peak traffic times, the Engineer may direct the Contractor to provide additional monitoring personnel. Payment will be made as extra work according to Article 1109.03, B.
1. Maintain a trained Traffic Control Technician on staff,
even though the traffic control portion of the contract may be subcontracted.
The trained Traffic Control Technician
is required to have attended and passed the exam in an ATSSA Traffic Control
Technician, IMSA Work Zone Traffic Control, Iowa AGC Traffic Control Technician
class, Minnesota DOT Traffic
Control Supervisor training class,
or Texas Engineering Extension Service Work Zone Traffic Control training
class. This trained Traffic Control
Technician is responsible for overall management of the Contractor's quality
control program for traffic control. Starting
April 2018, the Traffic Control Technician shall retake and pass the exam in
one of the approved classes every 5 years. To maintain trained status, the Traffic Control Technician shall attend
and pass the exam in an approved training class at a minimum of every 5 years.
2. On a daily basis as the project is constructed, perform the following quality control work associated with monitoring and documenting traffic control conditions:
a. Review all traffic control operations for compliance with contract documents and maintain a project traffic control daily diary in a format provided by the Contracting Authority. Submit this diary to the Engineer. It will become a part of the Contracting Authority's permanent project records. The Engineer may require submission of completed portions of the daily diary at routine intervals during construction of the project. In the diary include:
· Listing and station location of traffic control used each day referenced to the appropriate Standard Road Plan, project plan sheet, etc.,
· All reviews of traffic control devices and operations, whether satisfactory or unsatisfactory, and corrections made,
· Approved changes to the contract document’s traffic control,
· Incidentals affecting the efficiency and safety of traffic, and
· A daily list of trained flaggers used, including hours worked.
b. Monitor traffic operations and submit proposed Traffic Control Plan changes to the Engineer for approval.
c. Coordinate all changes to the Traffic Control Plan.
d. Coordinate all traffic control operations, including those of subcontractors and suppliers.
3. Employees who install and remove temporary traffic control signs and devices located within the traveled way or median shall be supervised by a Traffic Control Technician trained per Article 2528.01, C, 1 the Traffic Control Technician supervising the installation or removal of temporary traffic control devices and signs shall be on site and document in the daily traffic control diary what was installed or removed.
Use materials meeting the requirements of Part 6 of the MUTCD and Division 41 for the respective traffic control signs and devices.
1. Furnish signs that are of the size and type shown in the contract documents and use retroreflective sheeting meeting the requirements of Article 4186.03.
2. For Interstate and Primary projects, furnish diamond shaped warning signs that are 48 inches by 48 inches unless specified otherwise in the contract documents.
3. For traffic control zones in duration for 4 calendar days or more, mount signs on fixed posts.
4. Signs for traffic control zones in duration for less than 4 calendar days may be mounted on moveable skids or fixed posts.
5. Meet the following requirements for fixed post mounted signs:
a. Sign sheeting applied to rigid wood or metal.
b. Mounted at a height of at least 7 feet, measured from the bottom of the sign to the near edge of the pavement. A secondary sign on the same post may be mounted 1 foot lower than specified above.
c. A clear distance 2 feet behind a curb or beyond the edge of the shoulder.
6. Meet the following requirements for moveable skid mounted signs:
a. Flexible roll-up sheeting or other skid mounted sign systems that meet NCHRP 350 or MASH requirements.
b. Mounted at a height of at least 1 foot above the roadway.
7. Ensure mounting devices are not so substantial as to be a hazard to vehicles. Meet the following requirements for posts mounted in existing soil:
a. Wood sign supports meeting the materials requirements of Article 4164.04.
b. 3.0 pounds per foot U-shaped rail steel posts.
c. 2 1/4 or 2 1/2 inch square 12 gage perforated steel tubing.
8. Dual-post and triple-post configurations using these sign supports are acceptable provided that no more than two posts occupy any 8 foot wide path. Bracing of these posts will not be permitted. Posts exceeding these requirements shall have breakaway features approved by the Engineer.
9. Ensure signs are in a condition so they are effective for the intended purposes when viewed from a vehicle. For nighttime installations, ensure the reflectance is adequate so that the message is clearly readable. Ensure signs are maintained in a near vertical position.
10. When indicated in the contract documents, use supplemental sign flags in conjunction with work zone signing. Use sign flags 16 inches square and sheeted with red Type XI retroreflective sheeting meeting requirements of Article 4186.03.
11. On projects where two new lanes are being constructed adjacent to an existing two lane highway, place TWO WAY TRAFFIC (W6-3) signs. Place them off the right shoulder of mainline: 1) after each public side road for each direction of travel for traffic that may enter from all intersecting side roads; or 2) at 1/2 mile intervals, whichever is less. Install these signs when grading activities start and leave in place until the entire four lane divided highway is opened to traffic. If the pavement is constructed under a separate contract, leave these signs in place after the grading contract is completed. They become the property of the Contracting Authority. The paving contractor then takes over these signs and removes them when the four lane divided highway is opened to traffic. Payment will be according to Article 2528.05, A.
12. When directed by the Engineer, cover or remove permanent signing that conveys a message contrary to the message of the temporary signing and not applicable to the working conditions. When the work is completed uncover or replace permanent signing. Permanent signs damaged by the Contractor’s activities shall be replaced at no charge to the Contracting Authority.
13. The END ROAD WORK (G20-2) sign may be eliminated for mobile or short duration (less than 1 hour) temporary traffic control zones.
14. When milled or scarified surfaces exist, sign approaches to scarified areas using ROUGH ROAD (W8-8) signs. Place signs at least 250 feet in advance of milled or scarified areas. Repeat signs for traffic that may enter within the scarified area from intersecting public roads. At locations where milled or scarified areas end at project limits, bridges, or end of day’s work; place BUMP (W8-1) signs within 50 feet in advance of each location. Erect, move, and maintain these signs until milled or scarified areas have been covered with new HMA or PCC pavement.
B. Portable Dynamic Message Signs
Furnish, place, operate (when specified), and maintain Portable Dynamic Message Sign (PDMS) meeting requirements of Article 4188.07 at locations shown on the plans. The Contractor maintains possession of PDMS upon completion of the project.
1. Testing and Configuration.
a. Physical and electronic access to PDMS shall be granted to the Engineer.
b. On Interstate and Primary projects:
1) At least 1 week before PDMS is deployed to a project, a testing and configuration meeting with the Engineer shall be held.
2) The Contractor, shall perform necessary configuration adjustments to the PDMS and cellular modem to allow remote control by the Contracting Authority’s NTCIP software.
2. Remote Operation.
a. On Interstate and Primary projects, the Department will remotely operate signs through use of a modem and NTCIP software.
b. Contracting Authority will use their own NTCIP compliant software to activate messages, check sign’s status, and perform diagnostic tests.
c. Anytime during the project, the Engineer may remotely activate a message on the PDMS. Any message placed on the PDMS shall not be removed or replaced by the Contractor unless requested by the Engineer.
3. Direct Operation.
a. On Secondary road projects, PDMS will be operated directly by either the Contractor or the Engineer.
b. The Engineer may request the Contractor to operate PDMS for advance traffic notification and warning. Authority to operate PDMS will be under the direction of the Engineer. The Contractor may only operate the PDMS to display messages authorized by the Engineer.
c. Promptly program and/or reprogram the computer to provide the messages as directed by the Engineer.
4. Maintenance.
a. Provide preventive maintenance necessary to achieve uninterrupted service. Provide monitoring of health of each PDMS to accomplish proactive preventive maintenance and provide uninterrupted service. This includes, but is not limited to, performing remote diagnostic tests of equipment’s operational status, monitoring status of system performance such as communication, battery status, etc.
b. Engineer may perform remote diagnostic tests of sign’s operational status and notify Contractor when a problem is detected.
c. Respond to service phone calls immediately and to the service request emails within 2 hours. Conduct remote or on-site troubleshooting and respond back to the Engineer with notification of action (i.e. device repaired remotely, sending field technician, etc.) within 2 hours of responding.
d. Provide unscheduled maintenance or total replacement of sign when sign is unable to display a message adequately within 24 hours of notification. Action shall be taken to resolve the following problems if they have been visually observed or confirmed by self diagnostics by the PDMS for three continuous days or seven intermittent days over a 2 week period.
1) An entire pixel board is showing failure.
2) Five or more pixel failures over entire message panel anytime while sign is deployed for use (blank or displaying a message).
3) Two or more pixel failures in any character when displaying a message.
e. Repairs shall be completed within 12 hours of initial notification or the Engineer may cause such work to be performed as may be necessary to provide this service. The cost for this restoration shall be borne by the Contractor.
1. Use Channelizing Devices that are of the type shown in the contract documents. Ensure all channelizing devices meet the current requirements of the MUTCD and Section 4188. Use reflective sheeting meeting the requirements of Article 4186.03.
a. Barricades.
1) Ensure Type III barricades have a minimum length of rail of 6 feet. When traffic is permitted in each direction around a Type III Barricade, ensure the Type III Barricade used has fully reflectorized faces on both sides of the rails.
2) Erect barricades in essentially a vertical position perpendicular to the direction of approaching traffic. Ballast them so as not to cover any striped rail.
b. Cones, 42 Inch Channelizers, Drums, and Tubular Markers.
1) Ensure cones, 42 inch channelizers, drums, tubular markers, and other traffic control devices meet the current requirements of the MUTCD, and Section 4188.
2) Ensure tubular markers meet the following:
a) Minimum 28 inch height and maximum 36 inch height from pavement surface.
b) Diameter facing traffic at least 2 inches in width.
c) Two bands of reflectorized white sheeting, each a nominal 3 inches wide with a maximum of 6 inches between bands, with the top band no more than 2 inches from the top of the tubular marker.
3) Cones may be used as channelizing devices in tapers and along lane lines during daylight hours only.
4) 42 inch channelizers may be used in place of drums in work areas remaining in place for up to three days. Spacing of channelizers shall be half the spacing required for drums or double the number of drums required.
c. Temporary Lane Separator System.
1) Installation.
Install according to the manufacturer’s recommendations.
2) Maintenance.
Repair or replace all damaged curb units or posts no later than 24 hours after the damage is reported to the Contractor.
3) Removal.
a) Upon completion of the project, the temporary lane separator system will remain the property of the Contractor for systems used in temporary traffic control zones. When placed as part of a permanent installation, the system will become the property of the Contracting Authority.
b) Repair all holes left in the pavement or bridge deck when the temporary lane separator system is removed. Holes shall be filled with a non shrink grout meeting the requirements of Materials I.M. 491.13.
2. Channelizing devices may be placed up to 2 feet beyond centerline or lane line at specific locations where actual work activity is taking place. Return channelizing devices to the original position when the work activity has passed.
3. Individual channelizing devices may be omitted during working hours in areas where placement interferes with the work. Channelizing devices on tapers are required at all times.
4. Do not intermix channelizing devices of different types.
5. For pedestrian path closures, use Type III Barricades to block the full width of the pedestrian path. Mount a SIDEWALK CLOSED (R9-9) sign to at least one of the Type III barricades at each closure.
Use temporary barrier rail as shown in the contract documents. Unless shown otherwise, use precast concrete units. Tie the units together as specified or as approved by the Engineer.
1. When specified in the contract documents furnish, install, and maintain a modular glare screen system on the top of concrete barrier rail according to the contract documents and the modular glare screen system manufacturer's instructions. Furnish a system consisting of modular base rails attached to the top of concrete barrier rail with blades evenly spaced and securely mounted to the base rails. Ensure the following:
· Modular base rails and glare screen blades are compatible so the base unit and blades can be securely attached to each other.
· Base rails and blades supplied are manufactured by the same manufacturer.
· The length of individual modular base rails is no longer than the nominal length of individual temporary concrete barrier rail sections.
· The width of the modular base rails is no wider than the top width of the concrete barrier rail.
· Glare screen blades are FHWA highway green in color and made of impact resistant non-metallic high density plastic material.
· Blade height is from 24 inches to 30 inches and width is from 6 inches to 9 inches.
· The same uniform sized blades are used throughout the work.
· The modular glare screen system is manufactured by a company on the approved manufacturer’s list in Materials I.M. 486.06, Appendix A.
2. Install the modular glare screen system according to the manufacturer's instructions and the approval of the Engineer. Install the system so that:
· It is centered along the longitudinal axis length of the top of the concrete barrier rail.
· The overhang of the base rails, blades, and associated assembly over the edges of the top of the concrete barrier rail is kept to a minimum.
· The modular base rails are flush with the top of the concrete barrier rail and they do not extend over the joints between concrete barrier rail sections. A maximum gap between base rails across barrier rail gaps shall be 12 inches.
3. Install glare screen blades so the combination of blade width and spacing provide for a minimum 22 degree sight cut-off angle.
4. Glare screen blades shall be free from reflective sheeting or other modifications and shall be consistent in appearance.
5. Maintain the modular glare screen throughout the work. Replace or repair damaged parts of the modular glare screen system, as soon as practical, at no additional cost to the Contracting Authority.
6. When moving temporary barrier rail with a modular glare screen system, the Contractor may temporarily remove base rails and glare screen blades, if necessary, to assist in the moving. Reinstall the removed base units and glare screen blades as soon as the temporary concrete barrier rail has been moved to its new location.
7. Perform final removal of the modular glare screens from the concrete barrier rail when directed by the Engineer. Upon removal, ensure there are no protrusions on the top of the concrete barrier rail.
1. Operation.
a. When indicating a right or left lane closure, operate in a sequential chevron mode.
b. When indicating a traffic split, operate in a flashing double arrow mode.
c. When indicating caution, operate in an alternating diamond mode.
2. Remote Communications.
When using an Arrow Board for stationary work zones on Interstate or Primary roadways, remote communication capabilities meeting requirements of Article 4188.11 are required.
3. Type and Size.
Type C Arrow Boards as defined in Part 6 of the MUTCD are required for all applications.
4. Testing and Configuration.
On Interstate or Primary roadways, at least 1 week before Arrow Board is deployed to a project, a testing and configuration process shall be performed with the Engineer.
1. General.
a. Set up and operate temporary traffic signals as shown in the contract documents. Ensure the temporary traffic signal system meets the physical display and operational requirements of conventional traffic signals as specified in Part 4 of the MUTCD. Unless stated otherwise in the contract documents, either a span wire or trailer mounted temporary traffic signal system may be provided.
b. In the event any part of the temporary traffic signal system malfunctions or a continuous red flash mode is encountered, furnish flaggers on a 24 hour/7 day a week basis until repairs are made and the signals are fully functional. For temporary traffic signals at intersections, install stop signs on all approaches until the signals are fully operational, at no additional cost to the Contracting Authority.
c. Notify the Engineer at least 48 hours prior to the use of the signals for timing approval and verification.
2. Equipment.
a. Portable or Span Wire Mounted Systems.
1) Furnish actuated signal controllers complying with NEMA and ITE standards. Ensure the temporary traffic signal system complies with the following:
a) Includes a solid state digital traffic signal controller capable of operating the signals according to MUTCD requirements and NEMA Standard TS-5. A copy of the manufacturer’s certificate of compliance is to be posted in the control cabinet (in a weatherproof folder) and made available to the Engineer upon request.
b) Has conflict monitoring complying with NEMA Standard TS1 and the following:
· Detects the presence of conflicting signal indications, absence of proper voltages, and proper operation of the controller.
· Upon detection of a conflict or loss of communication, all signals enter into flashing red mode.
2) For one lane two way traffic control:
a) Green Revert.
If during an All Red clearance interval a call occurs on the phase losing the right-of-way prior to a call on any other traffic phase, the right-of-way reverts to the previous traffic phase, initiating the initial green interval. The transfer is to be immediate without completing the All Red clearance interval.
b) Rest in Absence of Actuation.
In the absence of detector actuation of assertion or recall switch(es), the right-of-way indication dwells in All Red.
3) Comply with the following:
a) Clearance for overhead wiring is a minimum of 18 feet.
b) A detection area is located near the stop line with the downstream edge positioned 6 feet from the stop line. A second detection area is located 100 to 150 feet in advance of the stop line. The size of detection areas is 6 feet by 10 feet. A single above-ground detector may be used to provide detection for both areas.
c) Signal heads have 12 inch lenses and comply with ITE Specification “Vehicle Traffic Control Signal Heads”. All signal heads are equipped with visors and back plates. The backplate provides a minimum of 5 inches black field around the signal assembly and has a dull black finish.
d) A minimum of two traffic signal heads per approach. All signal heads mounted over the road surface are mounted a minimum of 15 feet from the bottom of the signal head to the top of the road surface. One signal head mounted over the center of the travel lane. All far right signal heads mounted a minimum of 8 feet from the bottom of the signal head to the top of the ground surface. Required signal heads for through traffic on any one approach located no less than 8 feet apart measured horizontally perpendicular to the approach between the centers of the signal faces.
b. Portable Traffic Signals.
1) Provide a system consisting of two or more self-contained trailer or pedestal mounted units. Two signal heads shall be visible for each approach.
a) Trailer systems shall have one signal head mounted on a mast arm capable of extending over the center of the travel lane and the other signal head mounted on the same trailer.
b) Pedestal systems shall have a signal head mounted on each side of the roadway. Pedestal systems may only be used up to 3 continuous days.
2) When using portable traffic signals for stationary work zones on Primary roadways for contracts let in October 2024 or later, remote communication capabilities meeting requirements of Article 4188.11 are required.
c. Span-Wire Mounted Systems.
Ensure posts meet the requirements of Article 2528.03, A.
3. Operational Requirements.
a. Locate signals, stop bars, and signs exactly as identified in the contract documents. Secure and level temporary traffic signal installations in a manner approved by the Engineer.
b. Program all temporary traffic signals for red flash upon startup, conflict, or power failure. Program the temporary traffic signal system to dwell in All Red.
c. For one lane two way traffic control operations, when an additional phase is used for a side road movement, only one long all red interval is to be used between active phases on each side of the work area.
d. Set signal timing as identified in the contract documents.
4. Equipment Crossings.
a. For equipment crossings, use a signal operator to control the signal system. Position this operator with good sight distance for both the mainline and haul road.
b. Program the signal system with fixed yellow and all red time periods so the operator can only activate the beginning of the yellow interval for mainline traffic.
c. When the equipment crossing is not in use, set the signal to yellow flash mode. If hauling operations are suspended for more than one week, cover the signal heads, or if portable trailer units are used, remove the trailers.
1. General.
a. Set up and operate either pole mounted or portable self contained LED temporary floodlights at locations shown in contract documents.
b. Ensure floodlighting is installed and in service before commencing work requiring nighttime traffic control according to the traffic control plan.
c. Exercise reasonable care to avoid interruptions during hours of darkness, promptly repair damage to system, and replace burned out lamps promptly.
2. Equipment.
a. Pole Mounted Floodlights.
1) Pole-mounted luminaire.
2) Mounting height of luminaires is no less than 35 feet above the roadway and as shown in the contract documents. Pole length determined by field measurement to obtain specified mounting height.
3) Place poles outside normal shoulder line at approximate locations shown on the contract documents.
4) Meet the following requirements for floodlighting luminaires:
• Standard roadway types with totally enclosed refractors.
• IES glare control rating of "cut off".
• Lamps with initial output rating at least 19,000 lumens.
• Photoelectric controlled for dusk to dawn operation.
• Approval of the Engineer.
5) Ensure clearance for overhead wiring at least 18 feet. Auxiliary poles used to furnish power to floodlighting offset 30 feet from traveled way unless there are right-of-way restrictions.
6) Above ground lighting circuits are aluminum or A.C.S.R. triplex.
7) Underground lighting circuits are type U.S.E. or U.F.
b. Portable Self Contained LED Floodlights.
1) Mounted on portable trailers containing solar cell array and storage battery system to power LED luminaire. Ensure system meets NCHRP 350 or MASH Category IV crash testing.
2) Ensure mounting height of LED luminaires is no less than 17 feet above roadway, or as shown in the contract documents.
3) Locate portable trailers so LED luminaire is centered over outside edge of pavement and trailer is on shoulder offset as far as possible from traveled way
4) Meet materials requirements of Article 4188.05 for LED Floodlighting Luminaires.
Apply Section 2551.
J. Flaggers and Automated Flagger Assistance Devices.
1. Prior to flagging operations, ensure the flaggers are trained in safe flagging operations that comply with Iowa DOT Flagger Training Materials, Part 6 of the MUTCD, and the Standard Specifications. Ensure training of flaggers includes the following:
a. Reviewing the current Iowa DOT Flagger Training Materials,
b. Issuing flagger training cards including the information below.
1) Employee name,
2) Date of training,
3) Name of Instructor, and
4) Expiration date of December 31 of the year following the training date.
2. Maintain a list of the flaggers trained and the date of the training.
3. Training is not required for short time, emergency, or relief assignment of employees to flagging operations. Payment will not be made in accordance with Article 2528.05, I.
4. Ensure flagger operations, equipment, and apparel comply with the current Iowa DOT Flagger Training Materials.
5. When nighttime flagging is required, provide auxiliary lighting to illuminate the flagging stations according to the MUTCD, Part 6 and current Iowa DOT Flagger Training Materials. Set up this lighting in such a manner to minimize glare to motorists. The cost of furnishing nighttime flagging station lighting is included in the lump sum price bid for Traffic Control.
6. Ensure flaggers always carry their flagger training card and show it upon request.
7. Automated Flagger Assistance Devices.
a. Contractor may choose to use Automated Flagger Assistance Devices (AFADs) for flagging operations. Ensure all AFADs meet the current requirements of the MUTCD Section 6E.04 and 6E.06.
b. AFADs shall be operated by trained flaggers who have been instructed in the operation of AFADs used on the project. Trained flaggers shall be available to step in as manual flaggers in case of an AFAD malfunction.
c. Place AFADs where flagger stations are shown on the project plans. AFADs shall be clearly visible to approaching traffic, and if used at night, illuminated as flagger stations.
d. A flagger operating an AFAD shall have direct line of sight to the AFAD location and an unobstructed view of approaching traffic. The use of a camera to monitor the AFAD and/or the approaching traffic is not permitted in lieu of a manual flagger.
e. Flaggers shall not perform other duties while operating AFADs. Flaggers shall not leave AFADs unattended at any time while they are in use. AFADs shall not be operated by a pilot car driver.
f. A single flagger is permitted to operate two AFADs if the following requirements are met:
1) The flagger has unobstructed view of both AFADs,
2) The flagger has unobstructed view of both directions of approaching traffic,
3) The distance between AFAD locations is not greater than 1000 feet.
g. Immediately replace AFADs with manual flaggers in the event of malfunction. The Contractor shall have an equal number of trained flaggers present on-site available to operate the number of AFADs in use.
h. Remove AFADs from the roadway when not in use.
K. Pilot Cars.
1. Pickup trucks or automobiles displaying Contractor's company insignia on doors of the vehicle, equipped with G20-4 signs reading: PILOT CAR - FOLLOW ME. Ensure two signs are mounted on vehicle to be clearly visible from both directions of traffic. Mount signs so bottoms are at least 1 foot above top of vehicle's roof.
2. Operate pilot cars so they maintain a uniform speed through work area, no greater than 40 miles per hour.
L. Temporary Portable Rumble Strips
Use temporary portable rumble strips of the type shown in the contract documents and meeting requirements of Article 4188.08.
1. Placement.
a. A temporary portable rumble strip panel consists of three individual temporary portable rumble strips placed on roadway surface.
b. Place centerline end of temporary portable rumble strip 6 inches from centerline of roadway perpendicularly extending its full length transversely across pavement surface.
c. Place each individual temporary portable rumble strip 15 to 20 feet apart within the temporary portable rumble strip panel.
2. Maintenance.
Ensure temporary portable rumble strips maintain alignment within 6 inches perpendicular to centerline of roadway when measured from one end to the other end of the individual temporary portable rumble strip.
3. Removal.
When temporary traffic control requiring temporary portable rumble strips is no longer in operation, remove temporary portable rumble strips from roadway.
M. Speed Feedback Signs.
Furnish, place, operate, and maintain speed feedback signs at locations shown on the contract documents. Ensure all speed feedback signs meet the current requirements of the MUTCD and Section 4188.
1. Definitions.
a. Speed Feedback Trailer.
Speed feedback trailers are mobile devices using speed feedback signs to capture vehicle speed for oncoming traffic.
b. Display.
The display is a device connecting to the speed feedback trailer capable of broadcasting the speed of oncoming traffic captured by the speed feedback sign. This device allows for vehicle speed feedback to the vehicle operator, allowing for speed adjustment throughout the remainder of the work zone.
2. Testing and Configuration.
3. Maintenance.
N. Safety Closure.
Two types of safety closures will be specified: road closures and hazard closures.
1. Road Closures.
a. Place fence meeting requirements of Article 2528.02 across roadway from outside edge of shoulder to outside edge of shoulder. Securely support fence so it is in a vertical position without sagging.
b. Place Type III barricade, described in Part 6 of the MUTCD, immediately in front of fence at the approximate roadway centerline. Mount ROAD CLOSED (RII-2) sign on the Type III barricade.
c. In lieu of Articles 2528.03, N, 1, a and b above, place a series of Type 3 barricades across roadway from outside edge of shoulder to outside edge of shoulder. Ensure gaps between Type 3 barricades are no greater than 6 inches. Mount ROAD CLOSED (R11-2) sign over the top two rails of on the Type 3 barricade located closest to the approximate roadway centerline.
d. Erect road closures as specified in the contract documents. Erect them on the mainline of roadway where public traffic is diverted onto an on-site detour and where public traffic is prohibited from entering work area.
e. Erect road closures beginning with the start of the contract period as specified in the contract documents, or when work commences.
2. Hazard Closure.
a. Place fence meeting requirements of Article 2528.02 across roadway from outside edge of shoulder to outside edge of shoulder. Securely support fence so it is in a vertical position without sagging.
b. Place Type III barricade, described in Part 6 of the MUTCD, immediately in front of fence at the approximate roadway centerline.
c. In lieu of Articles 2518.03, N, 2, a and b above, place a series of Type 3 barricades across roadway from outside edge of shoulder to outside edge of shoulder. Ensure gaps between Type 3 barricades are no greater than 6 inches.
d. Erect hazard closures as specified in the contract documents. Erect them at locations within work area when construction involves major hazards on existing or relocated roadways. Such hazards may be located at streams, gullies, railroads, bridge approaches, and driveway locations. Through public traffic should not normally encounter a hazard closure.
e. Erect hazard closures beginning with the start of the contract period as specified in the contract documents, or when work commences.
3. Responsibility.
a. Maintain location and condition of safety closures. Any Contractor who temporarily moves the safety closure for equipment or delivery of materials, shall replace it in its original position and is responsible for the restriction of public traffic into the closed area.
b. If a safety closure placed by the Contractor is required for an area after the Engineer's approval of completed work for that specific area, maintenance of that safety closure will become the responsibility of the Contracting Authority. The Engineer will document in writing the transfer of authority.
c. The Engineer will notify Contractor of the date of removal of safety closures. Safety closure remains property of the installing Contractor. If safety closure is not removed by the date specified in the notification, it will become property of the Contracting Authority and the Contractor will be charged for removal costs.
O. Truck-Mounted or Trailer-Mounted Attenuator.
1. When specified in the contract documents, furnish, operate, and maintain a Truck-mounted or Trailer-mounted Attenuator (TMA) that meets Test Level 3 (TL-3) requirements of NCHRP 350 or MASH-16.
2. Operate and maintain the TMA according to the manufacturer’s recommendations, the contract documents, and/or as directed by the Engineer. Place the TMA as detailed in the appropriate Standard Road Plans or other contract documents.
O P.Limitations.
1. Use sandbags or other crashworthy methods to anchor all traffic control devices subject to movement by wind.
2. During non-working hours, remove, cover, or turn down traffic control devices intended for working hours only, unless a drop-off or physical obstruction remains within 15 feet of a lane open to traffic. Signs or barricades are not required for work beyond 15 feet of a lane open to traffic. When traffic control devices are no longer needed, remove them.
3. Personnel in the highway right-of-way shall wear only orange or strong yellow green ANSI 107 Type R Class 2 apparel when exposed to traffic or construction equipment. Orange or strong yellow green colored or a combination of these colors, ANSI 107 Class E pants or shin reflectors/gaiters are also required to be worn at night. Shin reflectors/gaiters shall have a minimum of two 2 inch bands of retroreflective material spaced at least 6 inches apart. Background material shall extend at least 2 inches above and below retroreflective bands and continue through the length of shin reflector/gaiter. Shin reflector/gaiter shall completely encircle the leg and be worn on lower leg between knee and ankle.
4. The Engineer may require signs and traffic control devices to be recleaned by washing. Use a brush and water, and detergent or solvent as necessary. Include the entire target area or sign face, supplemental or auxiliary signs, if any, all reflectors, and faces of warning lights which are part of that device.
5. Ensure entry to and exit from work areas is in the direction of public traffic and does not cross open traffic lanes at other than designated locations.
6. During hours of darkness, operate equipment in the traffic control zone facing in the direction of traffic flow unless specified otherwise in the Traffic Control Plan. Darkness will include the period from sunset to sunrise and other times when conditions such as fog, snow, sleet or rain provide insufficient lighting to clearly identify persons and vehicles on the highway at a distance of 500 feet ahead.
7. Unless stated otherwise in the Traffic Control Plan, provide for a minimum of 2 miles between traffic control zones on rural roadways. The Engineer will determine minimum distances between traffic control zones on urban roadways.
8. Submit Traffic Control Plan modifications to the Engineer for review and approval prior to any changes being made. The Engineer may modify sign spacing to meet existing field conditions or to prevent obstruction of the motorist’s view of permanent signing.
9. Ensure vehicles (except ready mix trucks) hauling soil, aggregate, paving material, and other construction material to or from work area display a minimum 16 inch by 48 inch sign with the legend “DO NOT FOLLOW - INTO WORK AREA”, as shown in the contract documents. Comply with the following requirements for the sign:
· Orange with black lettering using Type VIII sheeting.
· Keep clean to maintain its visibility.
10. For lanes closed to traffic, place two drums meeting the requirements of Article 2528.03, C, every 1000 feet. For full depth excavations in a closed lane, place two drums in front of each location. Additional drums need not be placed for full depth excavations spaced closer than 150 feet.
11. Contractor vehicles and self-propelled equipment (except hand operated equipment) operating or parked within 15 feet of an open traffic lane (unless shielded by temporary or permanent barrier) and contractor, delivery, service and private vehicles entering or exiting work area shall display cab roof mounted amber or yellow high intensity rotating, flashing, or oscillating warning lights. Repair or replace vehicle warning lights not functional or missing within 24 hours.
12. Parking of private vehicles on Interstate right-of-way will be allowed if private vehicles are parked at least 15 feet away from an open traffic lane when Contractor is working. Parking of private vehicles on Interstate right-of-way is not permitted during non-working hours. Request approval from Engineer of location for parking of private vehicles.
13. Conduct operations within the same lane from the start of work area to end of work area and do not shift traffic from one lane to another lane unless allowed in the contract documents. If the contract includes work in adjacent lanes, space individual lane closures for each lane per requirements in Article 2528.03, O, 9.
2528.04 method of measurement.
Measurement will be as follows:
Lump sum.
B. Portable Dynamic Message Signs.
The Engineer will count the number of days each Portable Dynamic Message Sign is required to be in place along a road and capable of displaying messages to the traveling public. Days when PDMS is blank and is in good working condition, will be measured. Days when PDMS is unable to display a message due to cellular or mechanical problems will not be measured. Days when PDMS is on the roadway and not approved by the Engineer will not be measured.
The Engineer will measure the length of temporary barrier rail used in linear feet. The length of temporary barrier rail measured will be the length required per setup. Measurement will also be made for temporary barrier rail moved within, or added to, an existing setup when required by the contract documents. Measurement of temporary barrier rail, after its initial placement, will not be made unless it is required by the contract documents to be moved.
D. Temporary Lane Separator System.
The Engineer will measure the length of the Temporary Lane Separator System installed in linear feet.
E. Modular Glare Screen.
Measurement for Modular Glare Screen System will be in linear feet.
Article 2551.04 applies.
By count for each group installation of temporary traffic signals operated by a common control unit. A group installation is normally four signal heads at the same traffic conflict area.
H. Temporary Floodlighting Luminaire.
By count.
1. By count for the number of pilot cars used during each work shift. A shift is a scheduled period of work for the Contractor’s operations.
2. For a pilot car to be counted:
a. Use of the pilot car is necessary and it is used as part of preplanned work that is started that shift and is intended to proceed for a major part of the shift. If used less than 4 hours during a shift, one half pilot car will be counted.
b. Use of other pilot cars is necessary and they are used for at least 1 hour during the shift, perhaps intermittently, and this shall be the primary duty of the employee. If used less than 4 hours in a shift, one-half pilot car will be counted. If used at least 4 hours, but less than 12 hours, a total of one pilot car will be counted. If used 12 hours or more, an additional one-half pilot car will be counted for a total of 1.5 pilot cars for the shift.
J. Flaggers and Automated Flagger Assistance Devices.
1. By count for the number of flaggers used during each work shift. A shift is a scheduled period of work for the Contractor’s operations.
2. For flaggers to be counted:
a. Use of the flaggers is necessary and they are used as part of preplanned work that is started that shift and is intended to proceed for a major part of the shift. If used less than 4 hours during a shift, one-half flagger will be counted. If used at least 4 hours, but less than 12 hours, a total of one flagger will be counted. If used 12 hours or more, an additional one-half flagger will be counted for a total of 1.5 flaggers for the shift.
b. Use of other flaggers is necessary and they are used for at least 1 hour during the shift, perhaps intermittently, and this shall be the primary duty of the employee. If used less than 4 hours in a shift, one-half flagger will be counted.
3. AFADs will not be measured for payment separately, but they may be used as a supplement or an alternate to flaggers. Flaggers will include AFADs, if AFADs are used as described in this specification. Flaggers will be measured as a single unit for the combination of manual flagger and AFAD at each flagger station location. If more than one AFAD is controlled by a single manual flagger, Flagger will be measured for payment by the flagger station locations (AFAD locations).
K. Monitoring with Incident Response.
Calendar days based on the contract quantity. Additional personnel required by the Engineer to provide additional traffic monitoring of PDMS operation will be measured in calendar days per person needed.
L. Safety Closures.
By count for number of Safety Closures placed.
M. Truck-Mounted or Trailer-Mounted Attenuator.
The Engineer will count the number days that a TMA is required by the contract documents.
2528.05 basis of payment.
Payment will be at the contract unit price as described below. When the Engineer requires recleaning of reflectorized surfaces of signs and traffic control devices, payment will be made as extra work according to Article 1109.03, B. All signs and traffic control devices furnished by the Contractor remain the Contractor's property at the completion of the work and are to be removed from the site when no longer needed.
1. Lump sum when there is a contract item for Traffic Control.
2. Payment is full compensation for:
· Erecting, maintaining, moving, and removing all traffic control devices required by the contract documents, including warning lights,
· Furnishing all materials, labor, and equipment, and
· Traffic quality control.
B. Portable Dynamic Message Signs.
1. Payment will be at the contract unit price per calendar day for each Portable Dynamic Message Sign measured as provided in Article 2528.04, B.
2. Payment is full compensation for furnishing, placing, operation (when specified), and maintenance of PDMS. Payment includes the cost of preventative and unscheduled maintenance, cellular communication, on-board software, hardware, and power supply.
1. Linear feet of Temporary Barrier Rail measured.
2. Maintenance of temporary barrier rail is incidental to Temporary Barrier Rail.
3. Payment for repair or replacement of temporary barrier rail damaged by public traffic will be paid according to Article 1109.03, B.
D. Temporary Lane Separator System.
1. Linear feet of Temporary Lane Separator System measured
2. Payment includes installation, maintenance, repair, removal of the temporary lane separator system (if installed in a temporary traffic control zone), and all required pavement or bridge deck repair.
E. Modular Glare Screen.
1. Linear feet of Modular Glare Screen System measured.
2. Payment is full compensation for:
· Material,equipment, and labor to furnish and install the system on the top of the temporary concrete barrier rail,
· Maintenance of the system,
· Repairing or replacing damaged parts of the system,
· Removing and reinstalling the system if necessary when moving the concrete barrier rail, and
· Final removal of the system from the top of the concrete barrier rail.
Article 2551.05, A, applies.
1. Each, for individual group installations operated by a common control unit, normally four signal heads at the same traffic control area.
2. Payment is full compensation for furnishing, installing, maintaining and servicing the controller, signal heads, traffic detection system, signal operator, costs for electrical energy, and the cost of removing temporary traffic signal materials from the construction site. The Contractor shall supply their own breaker box and power meter and shall not connect to existing Contracting Authority owned circuits to supply power for temporary traffic signals.
H. Temporary Floodlighting Luminaire.
1. Each.
2. Payment
is full compensation for: furnishing, installing,
maintaining and servicing temporary floodlighting units, costs for electrical
energy, cost of removing lighting materials from construction site, and Contractor
shall supply their own breaker box and power meter and shall not connect to existing
Contracting Authority owned circuits to supply power for temporary floodlighting.
Predetermined contract unit price per each for the number of shifts each pilot car was operated.
J. Flaggers and Automated Flagger Assistance Devices.
1. Predetermined contract unit price per each for the number of shifts each flagger was used.
2. Payment is full compensation for providing trained flaggers according to Article 2528.03, J.
3. No direct payment for AFADs will be made for installation, operation, relocation, maintenance, or removal of the devices.
4. Additional flagging related signs and devices necessary to comply with requirements related to the use of AFADs will not be paid for directly but shall be incidental to Traffic Control.
K. Monitoring with Incident Response.
1. Per calendar day for the number of calendar days used.
2. This payment is full compensation for:
· Furnishing the necessary vehicle (including operation, maintenance, and supplies),
· Furnishing the operator,
· Documentation of any events that restrict the normal flow of traffic including responses to an emergency situation,
· Re-erecting, repairing, or replacing traffic control devices,
· Providing assistance to persons with vehicle problems,
· Moving stalled vehicles, and
· Summoning further assistance when needed.
3. Payment for the number of calendar days that additional personnel, such as for PDMS operation required by the Engineer, will be the contract unit price per calendar day. Payment is full compensation for furnishing the required personnel and necessary support vehicles.
L. Safety Closures.
Payment is full compensation for furnishing material, labor, and equipment necessary to erect, maintain, and remove Safety Closure, unless indicated otherwise in the contract documents.
M. Truck-Mounted or Trailer-Mounted Attenuator.
Payment will be at the contract unit price per calendar day for each TMA provided. Payment is full compensation for furnishing, placing, operating, and maintaining the TMA.