INSPECTION, ACCEPTANCE AND COMMUNICATION PROTOCOL OF CONNECTED DEVICES

 

 

GENERAL

Connected Portable Traffic Signals (CPTS) must meet the requirements found in the Manual on Uniform Traffic Control Devices (MUTCD 11th Edition) Part 6L.06 and Iowa DOT Specification Article 2528.03.G. Automated Flagger Assistance Devices (AFADs) must meet the requirements found in the MUTCD (11th Edition) Part 6L.02 and the Iowa DOT Specification Article 2528.03.O.2.a. CPTS and AFADs utilized on the Primary Highway System must utilize GPS and Communications requirements set forth in Article 4188.11 and this IM.

 

APPROVAL PROCEDURES WHEN 4188.11 APPLIES

 

Approval Request Submittal Form: When a vendor is requesting the Department to evaluate its ability to meet 4188.11 and this IM, the vendor shall  make a device for testing available either by delivery to Ames, Iowa or virtually.  Complete and submit the form “ Connected Temporary Traffic Control Device Approval Request Form” found Here:

 

Communications Protocol: The WZDx Device Feed will be required to be Version 4.1 or greater and using the Traffic Signal Object for each temporary traffic signal deployed in Iowa.  The Traffic Signal Object will include the properties Core Details <https://github.com/usdot-jpo-ode/wzdx/blob/main/spec-content/objects/FieldDeviceCoreDetails.md> and Mode <https://github.com/usdot-jpo-ode/wzdx/blob/main/spec-content/enumerated-types/TrafficSignalMode.md>. Additional details on the WZDx Device Feed - Traffic Signal Object can be found here: <https://github.com/usdot-jpo-ode/wzdx/blob/main/spec-content/objects/TrafficSignal.md>.  Additional information can be found in Appendix A, (Connected Temporary Traffic Control Device Communication Requirements… or (CTTCDCR)

 

Appendix A  describes in detail the communications protocol.

 

APPROVED PRODUCTS

Approved Products of CPTS meeting the requirements of Article 4188.11 will be listed in Appendix A B of this IM within MAPLE.  Approved Products for AFADs meeting the requirements of Article 4188.11 will be listed in Appendix C of this IM within MAPLE.

 

MAPLE does not list regular portable temporary traffic signals.

 

ACCEPTANCE

Acceptance of CPTS and AFADs, as well as retrofit kits for both are by Brand Name as listed in MAPLE.