crushed white car on truck trailer bed next to bent 85 mile per hour sign

May 7, 2018

The 2009 MUTCD1 contains a standard on the application of a speed limit sign, stating “speed zones (other than statutory speed limits) shall only be established on the basis of an engineering study that has been performed in accordance with traffic engineering practices.” The MUTCD does not provide a precise definition of an “engineering study.” This ITRE lead study produced research products NCDOT can use to provide consistency to the studies that engineers conduct to support recommended speed limits. A speed limit study can be fully documented with the form provided in this research study. Further appendices provide supporting information and guidance for completing the form and determining an appropriate speed limit.

The link to the final report and project details can be found at: