Evaluating the Safety In Numbers effect for pedestrians at urban intersections.

Citation data:

Accident; analysis and prevention, ISSN: 1879-2057, Vol: 106, Page: 181-190

Publication Year:
2017
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PMID:
28623749
DOI:
10.1016/j.aap.2017.06.004
Author(s):
Murphy, Brendan, Levinson, David M, Owen, Andrew
Publisher(s):
Elsevier BV
Tags:
Social Sciences, Engineering, Medicine
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article description
Assessment of collision risk between pedestrians and automobiles offers a powerful and informative tool in urban planning applications, and can be leveraged to inform proper placement of improvements and treatment projects to improve pedestrian safety. Such assessment can be performed using existing datasets of crashes, pedestrian counts, and automobile traffic flows to identify intersections or corridors characterized by elevated collision risks to pedestrians. The Safety In Numbers phenomenon, which refers to the observable effect that pedestrian safety is positively correlated with increased pedestrian traffic in a given area (i.e. that the individual per-pedestrian risk of a collision decreases with additional pedestrians), is a readily observed phenomenon that has been studied previously, though its directional causality is not yet known. A sample of 488 intersections in Minneapolis were analyzed, and statistically-significant log-linear relationships between pedestrian traffic flows and the per-pedestrian crash risk were found, indicating the Safety In Numbers effect. Potential planning applications of this analysis framework towards improving pedestrian safety in urban environments are discussed.

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