The Effects of the All-red Clearance Interval on Intersection Accident Rates in Indiana
Purdue University, Joint Highway Research Project, 1992 - Electronic traffic controls - 112 pages
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.
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LITERATURE REVIEW 4
RESULTS AND DISCUSSION
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accident rate reduction accident types left addition all-red clearance interval all-red clearance interval's all-red interval implementation angle accident rates Avenue chapter Chi-square test clear cut conclusion clearance interval's inability critical sum difference exists End Accident Rates Federal Highway Administration found in Table graph Highway Research Project inability to reduce Indiana data indicate injury accidents interpreted as evidence intersection accident rates interval did little interval was added Joint Highway Research left turn accident million entering vehicles Mishawaka number of accidents previous level Purdue University rate of increase RATES IN INDIANA Rates The results Rear End Accident red clearance intervals reduce accident rates right angle accident right turn accident Signed Rank Test speed limits statistical tests Student's t-test test sum less total accident rates total number traffic engineers traffic signal traffic volumes treated group treated intersections treatment group treatment intersections turn accident rates twenty-five intersections two-tailed test Wilcoxon Signed Rank