Recommended CitationRoper, B. A., J. D. Fricker, K. C. Sinha, and R. E. Montgomery. The Effects of the All-Red Clearance Interval on Intersection Accident Rates in Indiana. Publication FHWA/IN/JHRP-90/07. Joint Highway Research Project, Indiana Department of Transportation and Purdue University, West Lafayette, Indiana, 1990. https://doi.org/10.5703/1288284313432
The research reported is an evaluation of all-red clearance intervals as the second phase of a project involving traffic signal operation. The first phase of the project dealt with leading versus lagging left turn signal phasing. The study analyzed both the short-term and long-term effects of all-red interval on accident rates in Indiana using accident records for the years 1981 to 1987. The results contradict those of previous studies. Statistical tests indicated that all-red clearance intervals did not cause a reduction in accident rates at the intersections studied in Indiana.
all-red clearance interval, accident rate, traffic signal, safety
Joint Highway Research Project
West Lafayette, IN
Date of this Version