A model is described which uses gap acceptance concepts and considerations for safe maneuvering to calculate the theoretical probability of completing a lane-change under various traffic flow conditions and to evaluate the effectivenes of various sign locations. A discussion of the model is presented as well as the development of lane-change distance-probability relationship and the effectiveness of location of diversion and directional signs. It is concluded that the probability curves for the distance involved in a lane-change maneuver on a four-lane freeway provide a reasonable measure of effectiveness for the location of a sign. An evaluation of the current practice of locating directional signs reveals that both the 1.6-km and 3.2-km signs are approximately the same in effectivenss. The gain in effectiveness from locating real time diversion signs of 50-cm letter height, 0.4 km (0.25 mile) in advance of the diversion point, is relatively small.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 122-124
  • Monograph Title: Highway capacity, traffic flow, and traffic control devices
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183556
  • Record Type: Publication
  • ISBN: 0309026733
  • Files: TRIS, TRB
  • Created Date: Dec 3 1978 12:00AM