Evaluation of Mid-block Accident Black Spot Treatments
Monash University Accident Research Centre - Report #48 - 1993
Author: M. Tziotis
Full report in .pdf format [1.4MB]
The implementation of an Accident Black Spot Program was first introduced in Victoria in 1979. The program's objective was to reduce the frequency and severity of crashes at locations experiencing a poor accident record by applying cost effective accident countermeasures. The purpose of this study was to evaluate mid-block 'Black Spots' treatments, focusing on the resultant changes in casualty crash frequencies and the economic worth of these treatments following their implementation.
The major findings of the study were that the treatment of high accident 'Black Spot' mid-blocks (1980 - 1989), provided highly significant reductions in casualty crashes of 30.5% (compared to 33.4% for intersections, Corben & Foong, 1989), while also returning high economic benefits, Net Present Worth of approximately $19.8 million (1992), with a Benefit Cost Ratio of 7.59 (7.13 for intersections, Corben & Foong 1989).
Other key findings were that targeted pedestrian treatments were highly significant in reducing pedestrian casualty crashes by 52%, and all casualty crashes within pedestrian mid-block 'Black Spots' by 37.4%, with new pedestrian signals achieving a significant 49.5% reduction in pedestrian casualty crashes (41.5% overall). Off-path/head-on treatments were also highly significant in reducing those types of crashes by 52. 1 % (41.8% overall), with roadworks in this case the most successful treatment (ie., 57.4% in the targeted crash type and 55.8% overall). Roadside hazard treatments reduced pole accidents significantly by 68.4%, while the use of a combination of treatments for differing types of accidents reduced casualty crashes by a highly significant 29.1%.