Citation

Chitturi M, Benekohal R, Hajbabaie A, Wang MH, Medina J. ITE J. 2010; 80(6): 26-28, 33-35.

Copyright

(Copyright © 2010, Institute of Transportation Engineers)

DOI

unavailable

PMID

unavailable

Abstract

Automated speed-radar photo enforcement (SPE) is being used by several states to reduce speeding and improve safety in highway work zones. This study examines three data sets from Illinois to evaluate the effectiveness of SPE in reducing vehicle speed and speed violators. Results showed that near the SPE, speeds for free-flowing cars were reduced by 4-8mph and speeds for free-flowing heavy vehicles were reduced by 3-7 mph. The percentage of drivers exceeding the speed limit near the SPE was reduced significantly. In some of the data sets, speeds of vehicles were also reduced at a location 1.5 miles downstream of the SPE location, although to a lesser extent. The percentage of vehicles speeding was also reduced at the downstream location. However, the SPE showed little or no halo effect on the speed of vehicles after they departed from the work zone.