Arthur Huang David Levinson () (Nexus (Networks, Economics, and Urban Systems) Research Group, Department of Civil Engineering, University of Minnesota)
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Daylight saving time (DST), implemented as an energy saving policy, impacts many other aspects of life; one is road safety. Based on vehicle crash data in Minnesota from 2001 to 2007, this paper evaluates long- and short-term effects of DST on daily vehicle crashes. To provide evidence to explain the causes of more/fewer crashes in DST, we examine the impact of DST on crashes in four periods of a day: 3 am-9 am, 9 am-3 pm, 3 pm-9 pm, 9 pm-12 pm. The effects of risk and exposure to traffic are also separated. Our statistical models not only include weather conditions and dummy variables for days in DST as independent variables, but also consider traffic volumes on major roads in different periods of a day. Our major finding is that the short-term effect of DST on crashes on the morning of the first DST is not statistically significant. Moreover, it is interesting to notice that while DST per se is associated with fewer crashes during dusk, this is in part offset because it is also associated with more traffic on roads (and hence more crashes). Our path analysis shows that overall DST reduces crashes.
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Publisher Info
Paper provided by University of Minnesota: Nexus Research Group in its series Working Papers with number
000039.
Length: Date of creation: 2008 Date of revision: Publication status: Published in working paper Handle: RePEc:nex:wpaper:daylightsavingstime
Contact details of provider: Postal: Dept. of Civil Engineering, 500 Pillsbury Drive SE, Minneapolis, MN 55455 Phone: +01 (612) 625-6354 Fax: +01 (612) 626-7750 Web page: http://nexus.umn.edu More information through EDIRC
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