Final Report on the Analyses of Traffic Accidents. FAST-TRAC Phase III211 Deliverable. Semi-Annual Reports on Total Accidents: Trends, Types and Analysis 211 of 'Before and After' Studies

摘要

This report contains the results of an analysis of traffic accidents in the City211u001eof Troy, Michigan, where the Sydney Coordinated Adaptive Traffic System (SCATS) 211u001ewas deployed as part of a federal demonstration program. The analyses includes a 211u001etrend analysis and a comparison with a control city. The SCATS controllers were 211u001einstalled in 1992 and 1993, and the analyses are based on traffic accident data 211u001efrom 1989 through 1995. These data, along with data on intersection geometry and 211u001etraffic volume were entered in an Interactive Traffic Accident Geographic 211u001eInformation (ITAGI) system to assist in the analyses and to display the results. 211u001eThere were small changes in overall accident frequency at various subsets of 211u001eintersections, but there was no statistically significant increase or decrease in 211u001esystem-wide total or injury accidents after the installation of SCATS. There was 211u001ea significant reduction in turn-related accidents following the SCATS deployment 211u001eThis was partially due to the change in signal phasing, but this reduction was 211u001ealso found where the signal phasing was not changed. There was a large, and 211u001estatistically significant reduction in the severity of the injuries sustained in 211u001ethe injury accidents. The number of severe (incapacitating) injuries was reduced 211u001eby more than 50 percent. The results of other stratifications of the data are 211u001ediscussed in the report.