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Strategy E9. Provide Pavement Markings with Supplementary MessagesNCHRP Report 500 / Volume 5: A Guide for Addressing Unsignalized Intersection Collisions WHERE TO USEUnsignalized intersections with patterns of rear-end, right-angle, or turning crashes related to lack of driver awareness of the presence of the intersection.
DETAILSProviding pavement markings with supplementary messages (such as "STOP AHEAD") can help alert drivers and thus enhance the ability of approaching drivers to be more aware of the presence of the intersection. These markings should follow the Manual on Uniform Traffic Control Devices. KEY TO SUCCESSSelect a combination of marking techniques appropriate to conditions on particular unsignalized intersection approaches. Another key is the ability and commitment of the highway agency to maintain the markings adequately. ISSUESPotential difficulties may be encountered in the winter, when these markings may not be as visible to the driver. The pavement markings may also have a lower coefficient of friction compared to the rest of the approach, especially during wet conditions. TIME FRAME: ShortThis strategy does not require a long development process and can typically be implemented in 3 months or less. COSTS: LowCosts to implement this strategy are nominal. An agency's maintenance costs may increase. EFFECTIVENESSTRIED: Limited studies have suggested that installing supplementary pavement messages may decrease overall crashes by 6% and right-angle crashes at urban locations by 30%. COMPATIBILITYThis strategy can be used in conjunction with most other strategies for improving safety at unsignalized intersections. SUPPLEMENTAL INFORMATIONSupplementary pavement markings should follow the MUTCD, which drivers should understand with no need for special public education campaigns. 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 ContactJeffrey Shaw What’s NewSouth Carolina Case Study: Systematic Intersection Improvements Roundabout 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 HighlightsFHWA's Intersection Resources Library CD-ROM Mini-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 |
