SPEED LIMITATION AND MOTORWAY CASUALTIES: A TIME SERIES COUNT DATA REGRESSION APPROACH

The paper deals with the effect of a lowered speed limit on the number of accidents in which there are fatalities, injuries and vehicle damage on Swedish motorways. Two models extending the Poisson and negative binomial count data models are used for estimation. The extended models account for both overdispersion and potential dependence between successive counts. The inferences of the parameters depend on the assumed form of overdispersion. It is found that the speed limit reduction has decreased the number of accidents involving minor injuries and vehicle damage. Furthermore, the models allowing for serial correlation are shown to have the best ex ante forecasting performance.

  • Availability:
  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • JOHANSSON, P
  • Publication Date: 1996-1

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00716342
  • Record Type: Publication
  • Report/Paper Numbers: HS-041 963
  • Files: HSL, TRIS, ATRI
  • Created Date: Feb 6 1996 12:00AM