Study of high-tension cable barriers on Michigan roadways.
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2014-10-01
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Abstract:Median-crossover crashes present the highest risk of fatality and severe injury among all collision types on
freeways. These crashes are caused by
a variety of factors, including drowsiness, driver distraction, impaired
driving, and loss of control. The primary countermeasur
e to reduce the opportunity for such crashes is the
installation of median barriers. The Michigan Department of Transportation (MDOT) began installing high-
tension cable median barriers in 2008 and has installed approximately 317 miles of high-tension cable median
barrier on state freeways as of September 2013. Given the capital costs required for this installation program,
as well as the anticipated annual maintenance and repairs costs, a comprehensive evaluation was conducted in
order to ascertain the efficacy of cable barrier systems th
at have been installed to date. Statistical analyses
showed that fatal and incapacitating injury crashes were
reduced by 33 percent after cable barrier installation.
The analysis also showed the median-crossover crash rate
was reduced by 86.8 percent and the rate of rollover
crashes was reduced by 50.4 percent. In contrast, less
severe crashes were found to increase by 155 percent
after cable barrier installation. A detailed analysis of
crashes involving a vehicle striking the cable barrier was
also conducted. The results showed that cable barriers we
re 96.9 percent effective in
preventing penetration in
the event of a cable barrier strike. Weather and road cond
itions were also found to play a role in the frequency
and severity of crashes, as well as cable barrier performance. An economic analysis was conducted to
determine the cost-effectiveness of the cable barrier system, and guidelines were developed to assist in
prioritizing candidate locations for cable barrier installation.
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