FHWA Evaluation for C-14

Improve highway safety by developing guidance and standards for the design of left turn pocket approach tapers on single and multilane highways

FHWA Evaluation of C-14 Reviewed By: Intersections Team/HSA/HRDS Comments: While better developed and consistent guidance would be helpful since this overlaps the MUTCD and AASHTO GB (and potentially AASHTO HSM and TRB HCM), it is questionable whether this project could have a significant impact. Making an explicit and statistically confident connection between turn lane geometrics and crashes would be quite difficult, as detailed geometric information at this level is not typically collected/inventoried or readily available. Additionally, while determining whether a turn lane should be added has a safety dimension (and CMFs), the length and particulars of the design are dependent on context, field conditions, traffic demand, etc. and rarely an explicit basis of safety. Review Date: December 17, 2021