Study Details

Study Title: Development of Models to Quantify the Impacts of Signalization on Intersection Crashes

Authors: Pernia et al.

Publication Date: 2002

Abstract: Traffic signals have been considered a way to improve traffic safety and operations at intersections where the warrants for traffic signal installation, specified by the Manual on Uniform Traffic Control Devices (MUTCD), are met. However, the impacts of signalization on crashes at intersections are complicated and have not been investigated in depth. This research focused in the evaluation of the impacts of signalization on crashes at newly signalized intersections in Florida through the development of statistical crash prediction models that can estimate the expected number of crashes at an intersection before and after the installation of traffic signals, in terms of total number of crashes and number of crashes for different crash types, including angle, left-turn, rearend and other crashes. In the research, a before and after analysis was also performed for number of all crashes, different type of crashes, different crash severities, and crash rates, as well as an evaluation of the impacts of signalization on crashes through a case based crash prediction system. The original crash database used in this research was taken from the Florida crash database maintained by FDOT. It consists of all crashes occurred on state roads within a ten-year period from 1989 to 1998. This database is updated yearly and includes all long form reported crashes with a fatality, an injury, and high property damage occurred on state roads.

Study Citation: Pernia, J.C., Lu, J.J., Weng, M.X., Xie, X., and Yu, Z., "Development of Models to Quantify the Impacts of Signalization on Intersection Crashes." Florida Department of Transportation, (2002).

CMFs Associated With This Study

Category: Intersection traffic control

Countermeasure: Install a traffic signal

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.62381 StarAngleAllNot specifiedAll
0.5501 StarAngleAllNot specifiedAll
0.85151 StarAllAllNot specifiedRural
0.62381 StarAllKNot specifiedAll
1.48-481 StarRear endAllNot specifiedAll
0.71291 StarAngleAllNot specifiedAll
0.83171 StarAllAllNot specifiedUrban
1.15-151 StarAllONot specifiedAll