The Temporary Lane Separator System consists of a combination of longitudinal curb units and upright flexible posts. These systems shall meet the requirements of specification 4188.05 for Temporary Lane Separator System. Approved Products are listed in the Materials Approved Products Listing Enterprise (MAPLE).


All products submitted for approval must comply with the most recent edition of the Manual for Assessing Safety Hardware (MASH). Devices submitted with modifications to previously approved NCHRP-350 products must be fully compliant with the most recent edition of MASH.


It is the intent of the department to utilize products that comply with the most recent edition of MASH.


Manufacturers shall indicate MASH-16 compliance by December 31, 2021 to remain an approved product within MAPLE.




Acceptance of Temporary Lane Separator System will be based on satisfactory evaluation of submitted technical data sheets and brochures furnished to the Iowa Department of Transportation, Construction and Materials Bureau, Ames, Iowa, and the manufacturer certification statement of specification compliance. A list of approved manufacturers based on technical data / brochure evaluation and certification documentation is listed within MAPLE.  A sample temporary lane separator system may be requested and required at the discretion of the Construction and Materials Bureau.



The manufacturer shall provide the following statement of certification:



Certification Statement


This is to certify that (manufacturer name, product number) this Temporary Lane Separator System meets the requirements of the applicable specifications of the Iowa Department of Transportation.






Authorized Signature and Date




A responsible company representative shall sign the certification statement.