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Strategy E7. Provide Dashed Markings (Extended Left Edgelines) for Major-Road Continuity Across the Median Opening at Divided Highway IntersectionsNCHRP Report 500 / Volume 5: A Guide for Addressing Unsignalized Intersection Collisions WHERE TO USEUnsignalized intersections on divided highways. The strategy is particularly appropriate for intersections with patterns of rear-end, right-angle, or turning crashes related to lack of awareness by the driver on the minor road to the presence of the intersection.
DETAILSProviding dashed markings (extended left edgelines) to define median roadway area at divided highway intersections can help distinguish the median area from the through roadway and, thus, enhance the ability of approaching drivers to be more aware of the presence of the intersection. KEY TO SUCCESSSelect a combination of marking techniques appropriate to conditions on particular unsignalized intersection approaches on divided highways. This engineering judgment should, where possible, be accompanied by a human-factors assessment of marking needs. Another key is the ability and commitment of the highway agency to maintain the markings adequately. ISSUESNone identified. 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: The effectiveness of this strategy in reducing crashes has not been satisfactorily quantified. COMPATIBILITYThis strategy can be used in conjunction with most other strategies for improving safety at unsignalized intersections. 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 |
