Effect of Street Pattern on Road Safety

Effect of Street Pattern on Road Safety
Shakil Mohammad Rifaat, Richard Tay, Alex de Barros

In the past 50 years, the loops-and-lollipops design has become the basic building block of many urban neighborhoods. In the field of traffic engineering, this combination of cul-de-sacs and loop streets is designed to discourage through traffic and improve road safety, and thus it has the support of many traffic engineers. Perhaps because of its intuitive appeal, few studies have examined the impact of this design on road crashes. The city of Calgary, Alberta, Canada, was used as a case study to examine the effects of neighborhood street patterns on the number of reported crashes. In the study, crashes were converted into equivalent property-damage-only crashes using various weighting factors to check the sensitivity of the finding. Results suggest that currently popular road patterns such as warped parallel, loops, and lollipops are safer than the traditional gridiron pattern. Moreover, this result is quite robust regarding severity weights or aggregation schemes, albeit with some variations in the absolute values of the estimated effects. However, changing the aggregation scheme had a significant effect on some of the control variables used in the model, especially the socioeconomic characteristics, although most of the road features and land use estimates remained robust.

(bad news for the New Urbanists, Traffic Engineers actually score a point).

One thought on “Effect of Street Pattern on Road Safety

  1. street pattern will always have an effect to road safety. i guess the current popular road patterns are safer than the grid iron pattern because with those patterns motorists are slowing don specially on those curve roads…
    i think road engineers will put more focus on it and do more studies to come out with the safest road pattern to ensure safety of everybody, but i know it will be a lot of work and not that easy to do, but if only motorists will become more responsible driving, no matter hat kind of road pattern they are taking, accidents will be avoided.


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