Research Papers

Evaluating the Silverberry Action Plan to Reduce Vehicle Speed

Filename FINAL-PAPER-79.pdf
Filesize 319 KB
Version 1
Date added June 10, 2012
Downloaded 4 times/fois
Category 2012 CMRSC XXII Banff
Tags Session 7A
Author/Auteur Karim El-Basyouny, Scott McDonald


Speeding in residential areas is one aspect of a larger set of problems related to speeding and traffic safety. The problem affects the safety of vulnerable road users (pedestrians and cyclists) specifically young children and creates a sense of insecurity due to the risk of being involved in a vehicle crash and the seriousness of ensuing injuries. To address the speeding problem in residential areas, the City of Edmonton and the Office of Traffic Safety in coordination with the Edmonton Police Services designed an action plan to reduce vehicle speeds using a combination of a low-cost engineering countermeasure (i.e. painting of a centerline) with other supplementary measures (such as enforcement and education activities). This paper investigated the effects of the Silverberry action plan. The basic premise is that a reduction in driving speeds would improve the overall level of safety by reducing crash risk and improve community livability. This objective was accomplished by analyzing speed data in a before-after experimental design involving a comparison group. Several confounding factors were addressed including free-flow, weather, sun glare, time of day, day of week, and vehicle classification. The results showed that speeds were reduced for all combinations of day of the week and time of day periods. All reductions were statistically signi ficant at the 0.05 level of significance. The largest reduction in mean speed occurred during the daytime on weekday followed by nighttime on a weekend. Overall, a 5% reduction in mean speed was found, which corresponds to an overall reduction of 2.6 km/h. Moreover, it was shown that the speed variance decreased with mean speed.

Karim El-Basyouny, Scott McDonald