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Safety Evaluation of Flashing Beacons at Stop-Controlled Intersections

Product Type

Journal Article

Author

Srinivasan, R., D.L. Carter, B.N. Persaud, K.A. Eccles, and C. Lyon

Date

Jan-08

Full citation

Srinivasan, R., D.L. Carter, B.N. Persaud, K.A. Eccles, and C. Lyon. Safety Evaluation of Flashing Beacons at Stop-Controlled Intersections. In Transportation Research Record: Journal of the Transportation Research Board, No. 2056, Transportation Research Board, National Research Council, Washington, D.C., 2008, pp. 77-86.

Abstract

FHWA organized a pooled fund study of 26 states to evaluate low-cost safety strategies as part of its strategic highway safety effort. One of the strategies chosen to be evaluated was the installation of flashing beacons at stop-controlled intersections. The intent of flashing beacons is to reduce the frequency of crashes related to driver unawareness of stop control. Geometric, traffic, and crash data were obtained at stop-controlled intersections for 64 sites in North Carolina and 42 sites in South Carolina. Empirical Bayes methods were incorporated in a before-after analysis to determine the safety effectiveness of installing flashing beacons while accounting for potential selection bias and regression-to-the-mean effects. Overall, installation of flashing beacons in North Carolina resulted in statistically significant reductions in total, angle, and injury-plus-fatal crashes. The intersections in South Carolina experienced little change following the introduction of flashing beacons, but the combined results from both states still indicated a statistically significant reduction in angle and injury-plus-fatal crashes. An economic analysis indicated that standard flashing beacons can achieve a 2:1 benefit-cost ratio.

Available From

Transportation Research Board

Link To Journal Article

Safety Evaluation of Flashing Beacons at Stop-Controlled Intersections

Keywords

Before and after studies
Benefit cost analysis
Collisions
Crash injuries
Empirical Bayes method
Fatalities
Flashing beacons
Highway safety
Intersections
Stop signs
Stop-controlled intersecti


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