Study Details

Study Title: Lesson Learned from the Application of Intersection Safety Devices in Edmonton

Authors: Contini and El-Basyouny

Publication Date:SEP, 2016

Abstract: The City of Edmonton began its intersection safety device (ISD) program in 2009 with the installation of50 cameras throughout the city. The ISDs are approach-specific and combine automated enforcement of red-light running and speed violations during the red and green phases of the intersection control. The goal of this study is to evaluate the safety performance of ISDs within the city of Edmonton, Canada and to identify factors that can lead to successful selection of future ISD sites. A before-and-after Empirical Bayes (EB) method is used to account for regression-to-the-mean and other confounding factors. A safety performance function and yearly calibration factors are developed using data from a set of reference intersections within Edmonton. The before-and-after analysis is applied at the overall intersection level and for each approach of the ISD intersections. The results showed significant reductions that ranged from 12% to 25% for total collisions, and from 33% to 43% for angle collisions. No significant reduction was observed for severe collisions at the intersection level, however significant reductions were found at the approach level at locations with a relatively higher collision history. The impact of site selection criteria on collision reduction was also evaluated. Greater reductions were found at sites with a higher collision frequency. Additionally, the impact of intersection characteristics on collision reduction was investigated. Speed limits, presence of separated right turn lane and the number of lanes were found to impact ISD collision reduction.

Study Citation: Contini, L. and K. El-Basyouny. "Lesson Learned from the Application of Intersection Safety Devices in Edmonton". Accident Analysis and Prevention, Vol. 94, (2016) pp. 127-134.

Study Report: Download the Study Report Document

CMFs Associated With This Study

Category: Advanced technology and ITS

Countermeasure: Install Intersection Safety Devices

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.74525.474 StarsAllAllNot specifiedUrban and suburban
0.963.993 StarsAllK,A,B,CNot specifiedUrban and suburban
0.9366.354 StarsAllONot specifiedUrban and suburban
0.89310.744 StarsRear endAllNot specifiedUrban and suburban
0.66633.444 StarsAngleAllNot specifiedUrban and suburban
0.88411.554 StarsAllAllNot specifiedUrban and suburban
1.031-3.063 StarsAllK,A,B,CNot specifiedUrban and suburban
0.88311.744 StarsAllONot specifiedUrban and suburban
0.86413.634 StarsRear endAllNot specifiedUrban and suburban
0.56943.064 StarsAngleAllNot specifiedUrban and suburban
1.043-4.33 StarsAllAllNot specifiedUrban and suburban
1.33-33.014 StarsAllK,A,B,CNot specifiedUrban and suburban
1.012-1.173 StarsAllONot specifiedUrban and suburban
0.9970.293 StarsRear endAllNot specifiedUrban and suburban
0.20279.844 StarsAngleAllNot specifiedUrban and suburban
1.042-4.183 StarsAllAllNot specifiedUrban and suburban
0.9792.13 StarsAllK,A,B,CNot specifiedUrban and suburban
1.081-8.113 StarsAllONot specifiedUrban and suburban
0.9643.643 StarsRear endAllNot specifiedUrban and suburban
0.64535.554 StarsAngleAllNot specifiedUrban and suburban