The paper shows that long term developments in mobility and safety can be related by an evolutionary growth and risk adaptation model. This model can be applied to historical data from Japan, USA, United Kingdom, and Germany, over long periods of time. Growth of mobility can be described by sigmoid curves which describe the road traffic saturation level and risk. The fatality rate follows a decreasing adaptation curve. A single peaked curve for the road fatalities per year is a necessary result from saturating growth and steadily decreasing risk adaptation. Long-term predictions are given, based on time-related evolutionary trends and cycles. It is argued that the present stagnation in safety improvements in some countries are temporary cyclical effects of the recent larger increase in motorized mobility and stagnated decrease of fatality rate. The relation between mobility growth and risk adaptation is seen as a result of the technological evolution of traffic in a self-organizing socio-economic system.

  • Supplemental Notes:
    • Paper, 3rd INSIRT Round Table "The Future of Mobility", Toulouse, France, 1991 and 6th World Conference on Transport Research, Lyon, France, 1992.
  • Corporate Authors:

    Institute for Road Safety Research, SWOV

    Bezuidenhoutseweg 62
    The Hague,   Netherlands  2594 AW
  • Authors:
  • Publication Date: 1992


  • English

Media Info

  • Features: Figures; References;
  • Pagination: 53 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00674060
  • Record Type: Publication
  • Report/Paper Numbers: R-92-36, HS-041 416
  • Files: HSL, TRIS
  • Created Date: Feb 8 1995 12:00AM