Among the main factors usually involved in road accidents stand those related to the road environment, which reflect either the presence of features affecting their likelihood (i.e. by increasing or decreasing the risk), or the provision (or absence) of conditions which may contribute to minimize the adverse consequences of those same accidents ( the "forgiving environment" concept). Therefore, safety should be a criterion taken into account at the various implementation stages leading to a final road layout, starting with the early planning phase. It is at the network level that road planning plays its main role as an instrument of transport policies and decisions, aiming at supra-national, national, regional or local goals. The evaluation of the safety effects of general road planning activities at the network level is difficult in nature, since it requires not only extensive and reliable data, but also a clear perception of the different factors and inter-relations involved, and an adequate time perspective. Within the scope of the Portuguese National Road Plan, launched in 1985, a significant effort has taken place aiming at the rehabilitation and new road construction, especially of new motorways and express roads. At the same time there has been a huge increase in car ownership and use on the Portuguese roads, expecially on those under the referred plan. At present, when a revision of the plan is under way as the next century approaches, it seems of interest to have some insight on how safety indicators related to that same network have evolved during the last decade, with special emphasis on years 1985, 90 and 95. This is possible due to the availability of traffic data on a nationwide basis. It is the object of this paper to report on that subject.

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  • Corporate Authors:

    PTRC Education and Research Services Limited

    Glenthorne House, Hammersmith Grove
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  • Authors:
    • DE MACEDO, A L
    • Cardoso, J L
    • SANTO, J Z
  • Conference:
  • Publication Date: 1998


  • English

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Filing Info

  • Accession Number: 00766057
  • Record Type: Publication
  • Report/Paper Numbers: VTI konferens 9A part 1
  • Files: TRIS
  • Created Date: Jul 15 1999 12:00AM