It is the conventional wisdom of the road safety movement that the behaviour of drivers can be changed through driver education, public information campaigns, and law enforcement. Unfortunately, there is growing evidence that intensified programmes on these three fronts produce little or no long-term gains in road safety. Real (rather than ideal) people are difficult to reprogramme in a free society. At the same time, there is growing evidence that some road situations are much more accident-prone than others. For example, two-lane highways are much more dangerous than four-lane ones; curves and hills are much more dangerous than straights and levels; and intersections (at which nearly half of all accidents occur) are much more dangerous than non-intersections. These situations represent cases in which the road environment demands more vehicle control than real drivers can always produce. The ideal technological solution both for safety and for traffic flow is to eliminate these road hazards altogether, including intersections, but this is very expensive and wasteful of land. This paper outlines a general "human factors" approach to the design of intersections and their signs to reduce driver confusion and error, and thus the frequency of accidents. In the present paper the theory and the evidence on the choice of levels of intersection control at four-way intersections are considered. This question has been in danger of falling into neglect since the study by Kitto which concluded that, "changes in the form of (four-way intersection) control frequently produced no significant results."(a) /TRRL/

  • Availability:
  • Corporate Authors:

    Technical Publications Limited

    C.P.O. 3047
    Wellington,   New Zealand 
  • Authors:
    • Kammann, R
    • Thompson, G
  • Publication Date: 1978-9

Media Info

  • Features: Photos; References; Tables;
  • Pagination: p. 203-6
  • Serial:
    • Volume: 33
    • Issue Number: 9
    • Publisher: Institution of Professional Engineers New Zealand
    • ISSN: 0028-808X

Subject/Index Terms

Filing Info

  • Accession Number: 00193949
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM