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FHWA Home / Safety / Intersection / Strategy E7. Provide Dashed Markings (Extended Left Edgelines) for Major-Road Continuity Across the Median Opening at Divided Highway Intersections

Strategy E7. Provide Dashed Markings (Extended Left Edgelines) for Major-Road Continuity Across the Median Opening at Divided Highway Intersections

NCHRP Report 500 / Volume 5: A Guide for Addressing Unsignalized Intersection Collisions

WHERE TO USE

Unsignalized 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.

Depiction of a cross street intersecting a divided highway at a T-intersection. The pavement markings on the divided highway do not stop at the opening for the median and cross street, but continue across the median opening.

DETAILS

Providing 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 SUCCESS

Select 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.

ISSUES

None identified.

TIME FRAME: Short

This strategy does not require a long development process and can typically be implemented in 3 months or less.

COSTS: Low

Costs to implement this strategy are nominal. An agency's maintenance costs may increase.

EFFECTIVENESS

TRIED: The effectiveness of this strategy in reducing crashes has not been satisfactorily quantified.

COMPATIBILITY

This 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
E71, 1200 New Jersey Avenue SE
Washington, D.C. 20590
(202) 366-9064
http://safety.fhwa.dot.gov

FHWA Resource Center – Safety and Design Team
19900 Governor's Drive, Suite 301
Olympia Fields, IL 60461
(708) 283-3545
https://www.fhwa.dot.gov/resourcecenter

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Page last modified on September 4, 2014.
Safe Roads for a Safer Future - Investment in roadway safety saves lives
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000