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Relationships Among Urban Freeway Accidents, Traffic Flow, Weather and Lighting Conditions

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  • Golob, Thomas F.
  • Recker, Wilfred W.
Abstract
Linear and nonlinear multivariate statistical analyses are applied to determine how the types of accidents that occur on heavily used freeways in Southern California are related to both the flow of traffic and weather and ambient lighting conditions. Traffic flow is measured in terms of time series of 30-second observations from inductive loop detectors in the vicinity of the accident prior to the time of its occurrence. Results indicate that the type of collision is strongly related to median traffic speed and to temporal variations in speed in the left and interior lanes. Hit-object collisions and collisions involving multiple vehicles that are associated with lane -change maneuvers are more likely to occur on wet roads, while rear-end collisions are more likely to occur on dry roads during daylight. Controlling for weather and lighting conditions, there is evidence that accident severity is influenced more by volume than by speed.

Suggested Citation

  • Golob, Thomas F. & Recker, Wilfred W., 2001. "Relationships Among Urban Freeway Accidents, Traffic Flow, Weather and Lighting Conditions," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt2fh4x5hp, Institute of Transportation Studies, UC Berkeley.
    • Handle: RePEc:cdl:itsrrp:qt2fh4x5hp
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    References listed on IDEAS

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    1. Jones-Lee, M W, 1990. "The Value of Transport Safety," Oxford Review of Economic Policy, Oxford University Press and Oxford Review of Economic Policy Limited, vol. 6(2), pages 39-60, Summer.
    2. Andrew Dickerson & John Peirson & Roger Vickerman, 2000. "Road Accidents and Traffic Flows: An Econometric Investigation," Economica, London School of Economics and Political Science, vol. 67(265), pages 101-121, February.
    3. Vickrey, William S, 1969. "Congestion Theory and Transport Investment," American Economic Review, American Economic Association, vol. 59(2), pages 251-260, May.
    4. repec:bla:econom:v:67:y:2000:i:265:p:101-21 is not listed on IDEAS
    5. Cajo Braak, 1990. "Interpreting canonical correlation analysis through biplots of structure correlations and weights," Psychometrika, Springer;The Psychometric Society, vol. 55(3), pages 519-531, September.
    Full references (including those not matched with items on IDEAS)

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