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The Effects of Daylight Saving Time on Vehicle Crashes in Minnesota

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Author Info

  • Arthur Huang
  • David Levinson

    ()
    (Nexus (Networks, Economics, and Urban Systems) Research Group, Department of Civil Engineering, University of Minnesota)

Abstract

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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File URL: http://nexus.umn.edu/Papers/DaylightSavingsTime.pdf
File Function: first version, 2008
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Bibliographic Info

Paper provided by University of Minnesota: Nexus Research Group in its series Working Papers with number 201008.

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Date of creation: 2008
Date of revision:
Publication status: Published in Journal of Safety Research 41 513-520.
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
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Related research

Keywords: daylight saving time; vehicle crashes; exposure; fatal crashes; traffic volume; Minnesota;

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References

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  1. Sood Neeraj & Ghosh Arkadipta, 2007. "The Short and Long Run Effects of Daylight Saving Time on Fatal Automobile Crashes," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 7(1), pages 1-22, February.
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Cited by:
  1. Guangqing Chi & Jeremy Porter & Arthur Cosby & David Levinson, 2009. "A Time Geography Approach to Understanding the Impact of Gasoline Price Changes on Traffic Safety," Working Papers 000092, University of Minnesota: Nexus Research Group.

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