Development of performance measures for non-motorized dynamics.
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2013-12-27
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Abstract:This report recommends performance measures for non-motorized (pedestrian and bicyclists)
traffic safety for Michigan cities. Based on the data collected from four Michigan cities, Ann
Arbor, East Lansing, Flint, and Grand Rapids, the research team analyzed non-motorized safety
at three levels (city level, census tract level, and corridor level). The census tract-level analysis
revealed that the number of access points, higher population with lower education, and higher
exposure measures tended to increase non-motorized crashes. Through detailed corridor-level
analyses, safety performance functions (SPF) for intersections and mid-blocks were developed.
The intersection SPFs showed that higher average daily traffic (ADT), more number of bars,
less number of lanes on minor approaches were associated with higher pedestrian crashes
while intersections with right turn lane and bus stops exhibited relatively high number of bicycle
crashes. Midblock SPFs also revealed that ADT, the number of access points, and the number
of bus stops were factors leading to more non-motorized crashes. This research also presents
results of before-and-after studies for non-motorized improvements and how performance
measures are used when determining countermeasures.
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