00756149

Component

https://doi.org/10.3141/1635-19

http://scholar.google.com...CENO&publication_year=1998

A before and after safety evaluation of the installation of a larger signal head design was conducted. The design consists of a 300-mm red light, a 300-mm amber light, and a 300-mm green light, all with 150-W lamps and a yellow backboard with an additional 50-mm reflective border. The signal head design was field tested in 10 urban intersections in British Columbia. The intersections were originally equipped with the standard signal head design consisting of a 300-mm 150-W red light; a 200-mm 69-W amber light, and a 200-mm 69-W green light, with a yellow backboard. An Empirical Bayes before and after safety analysis indicated that the improved signal head design had a significant effect in reducing the overall frequency and severity of accidents at the treatment sites. Accidents were reduced by approximately 24%; injury and fatal accidents were reduced by approximately 16%. Classical simple before and after techniques were found to overestimate these benefits by approximately one third. It is concluded that increasing traffic signal visibility through the improvement of signal head design is an effective measure of reducing both the frequency and severity of traffic accidents at signalized intersections.

This paper appears in Transportation Research Record No. 1635, Safety Analysis Related to Highway Design, Crash Costs, and Traffic Records Systems; Methodologies for Evaluating Safety Improvements.

English

p. 140-146

1998

Transportation Research Record

0309065070

Figures (3) ; References (13) ; Tables (4)

Before and after studies; Crash rates; Crash severity; Design; Evaluation and assessment; Field tests; Intersections; Luminous intensity; Safety; Signal lights; Size; Traffic signals; Urban areas; Visibility

Reduction (Decrease)

British Columbia

British Columbia

Design; Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control; I80: Accident Studies

TRIS, TRB, ATRI

Nov 10 1998 12:00AM

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