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Strategy E4. Provide a Stop Bar (or Provide a Wider Stop Bar) on Minor Road ApproachesNCHRP Report 500 / Volume 5: A Guide for Addressing Unsignalized Intersection Collisions WHERE TO USEApproaches to unsignalized intersections having traffic control devices that are not currently being recognized by some approaching motorists. Locations should be identified by patterns of crashes related to lack of driver recognition of the traffic control device (e.g., right-angle crashes related to stop sign violations).
DETAILSProviding visible stop bars on minor road approaches to unsignalized intersections can help direct the attention of drivers to the presence of the intersection. Where a stop bar is already in place, provision of a wider stop bar may be considered. KEY TO SUCCESSIdentify appropriate intersection approaches that would benefit from its use. The strategy is expected to be especially effective when applied on approaches where conditions allow the stop bar to be seen by an approaching driver at a significant distance from the intersection. This strategy is appropriate for locations with a pattern of angle crashes associated with stop sign violations where approaching drivers may not realize that an intersection is present until it is too late to stop. ISSUESNone identified. TIME FRAME: ShortThis strategy can be implemented quickly, typically in less than 3 months. COSTS: LowCosts for implementing this strategy are nominal. An agency's maintenance costs may increase. EFFECTIVENESSTRIED: One limited study has indicated that installing stop bars (or wider stop bars) on minor road approaches may reduce crashes by up to 19% and reduce right-angle crashes by up to 47%. COMPATIBILITYThis strategy can be used in conjunction with most other strategies for improving safety at unsignalized intersections. SUPPLEMENTAL INFORMATIONSigning in conformance with the Manual on Uniform Traffic Control Devices should be provided. 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 |
