Flashing beacons supplement stop signs and are intended to reinforce awareness of existing stop signs.
Beacons are flashing lights intended to draw a driver's attention towards the associated traffic control.
Flashing beacons supplement stop signs and are intended to reinforce awareness of existing stop signs. Two different types of intersection beacons are typically used, including standard overhead beacons mounted over the intersection and sign-mounted beacons that may be mounted on the stop sign or stop ahead and intersection ahead signs.
Several studies have evaluated the effectiveness of beacon installation.
The following table summarizes the studies where crash reductions were found.Crash reduction for Installation of Intersection Flashing Beacons
|Studies||Loc.||# of Sites||Beacon Type||Crash Type||Change in Crashes|
|Srinivasan et al. 2008||NC and SC||84||standard overhead||angle||-11.9% (5.4)|
|5||stop sign||angle||-58.2% (16.3)|
|Pant et al. 1992||OH||7||standard overhead||fatal||-56%|
|Murphy and Hummer 2007||NC||34||standard overhead||total||-12%|
|ran stop sign||-26%|
|Brewer and Fitzpatrick 2004||TX||4||standard overhead||prevent -able||-43%|
|Stackhouse and Cassidy 1996||MN||8||standard overhead||total||-39%|
|4||stop sign and intersection ahead signs||total||-40%|
More information is provided in this technical brief, which summarizes information about flashing beacons relevant to Iowa.
Antonucci, Nicholas D., Kelly K. Hardy, Kevin L. Slack, Ronald Pfefer, Zikhron Yaacov, and Timothy R. Neuman. Volume 12: A Guide for Reducing Collisions at Signalized Intersections. NCHRP Report 500: Guidance for Implementation of the AASHTO Strategic Highway Safety Plan. Transportation Research Board, 2004.
Stein, William J. and Timothy R. Neuman, Mitigation Strategies for Design Exceptions. Federal Highway Administration, Office of Safety. 2007.
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