Safety impacts of the I-35W improvements done under Minnesota's urban partnership agreement (UPA) project : final report.
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2017-06-01
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Edition:Final report
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Abstract:As part of an Urban Partnership Agreement project, the Minnesota Department of Transportation added lanes
and began operating a priced dynamic shoulder lane (PDSL) on parts of Interstate 35W. Following the opening of
these improvements, the frequency of rear-end crashes increased in certain sections, especially in the PDSL
region. The object of this study was to determine if these increases were direct effects of the improvements or
were due to changes in traffic conditions. Logistic regression analyses which controlled for changes in traffic
conditions indicated no direct effect on the likelihood of rear-end crashes due to operation of the PDSL; the
observed change in crash frequency was explained by the change in traffic conditions. This study also found
evidence for a nonlinear relationship between a proxy for traffic density, lane occupancy, and the probability of a
rear-end crash occurring during an hour. In several sections crashes were most likely when lane occupancies were
approximately 20%–30%, and crash likelihood tended to decrease for lane occupancies below and above this
range.
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