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Strategy I1. Provide Turn Path MarkingsNCHRP Report 500 / Volume 5: A Guide for Addressing Unsignalized Intersection Collisions WHERE TO USEComplex unsignalized intersections with a high frequency of crashes related to turning vehicle positioning (e.g., sideswipe crashes).
DETAILSAt most intersections, pavement markings are provided on the intersection approaches, but the pavement markings end near the stop line. Rarely are pavement markings extended into or continued through intersections. At complex intersections, however, it may be beneficial to provide motorists with additional information to help with vehicle positioning through the intersections. In particular, it may be desirable to extend pavement markings through intersections that have offset approaches, are skewed, have multiple turn lanes, or are located at unsignalized ramp terminals. This approach is especially useful for delineating vehicle turning paths through an intersection. The MUTCD provides guidance on extending pavement markings through intersections. KEY TO SUCCESSDetermine which maneuvers drivers are having trouble performing, and define and mark the appropriate turning paths. This may require extensive review of individual crash reports, as well as observations and measurements at a site. Proper maintenance of the markings will also be important to the success of this strategy. ISSUESIf too many markings are extended through the intersection, the intersection could become very confusing for drivers. In cases where snow and ice collect on the road, the effectiveness of the markings may be reduced. TIME FRAME: ShortThe implementation time for providing turn path markings could be 3 months or less. COSTS: LowThe costs involved in providing turn path markings are minimal. Agencies may experience additional maintenance costs. EFFECTIVENESSTRIED: The safety effectiveness of extending pavement markings through intersections has not been evaluated. COMPATIBILITYThis strategy can be used in conjunction with most other strategies for improving safety at intersections. SUPPLEMENTAL INFORMATIONHighway agencies may need to adopt a policy for extending pavement markings through intersections. Guidance is provided in the MUTCD. For more details on this and other countermeasures: http://safety.transportation.org For more information contact: FHWA Office of Safety Design FHWA Resource Center – Safety and Design Team 
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Program ContactEd Rice Jeffrey Shaw What’s NewRoundabout Outreach and Education Toolbox Stop-Controlled Intersection Safety: Through Route Activated Warning Systems Roundabouts: An Informational Guide, Second Edition (NCHRP Report 672) Roundabouts Peer-to-Peer Assistance How to drive a roundabout (WSDOT) Modern Roundabouts: A Safer Choice FHWA's Intersection Resources Library CD-ROM HighlightsMini-Roundabouts Technical Summary Access Management in the Vicinity of Intersections Technical Summary Intersection Safety Case Studies Intersection Safety Technologies Presentation: Intersection Safety Example Intersection Safety Implementation Plan |
