INTERURBAN ROADS AND MOTORWAYS. REPORT FROM ISRAEL --PIARC XVIII WORLD ROAD CONGRESS, BRUSSELS, BELGIUM, SEPTEMBER 13-19, 1987

On roads designed according to design speed, large differences can appear among the travel speeds along the alignment, a phenomenon that might constitute a safety risk. In order to estimate these differences quantitatively, and to measure the relationship between travel speed and design speed, tests were carried out on roads in Israel that were constructed over the past decade. As part of these tests, desired speeds were measured, which represent the travel speed of a single vehicle on road sections without any geometric or traffic constraints. The measurements were conducted on roads having various design speeds, different hierarchies, and in different topographic areas. The findings showed a correlation between the design speed of a certain road and the desired speed of drivers travelling this road. The proportion between the 85th percentile of the desired speed and the design speed is 1.10-1.15, and the gap between the two does not exceed 15-20 kph. The differences between the 95th percentile of the desired speed and the design speed are greater, especially when the straight section between two curves exceeds a certain length. Criteria and recommendations are presented for selecting the design speed according to road hierarchy, topographic area, traffic volume, and the distance between main junctions. For the covering abstracts of the congress see IRRD 812115 and 812116.

• Corporate Authors:

  Permanent International Assoc of Road Congresses

  27 rue Guenegaud
  Paris,   France 
• Authors:
  • Craus, J
• Publication Date: 0

Language

• English

Media Info

• Pagination: p. 153-67
• Serial:
  • Publication of: PERMANENT INTERNATIONAL ASSOCIATION OF ROAD CONGRE
  • Issue Number: 0
  • Publisher: Permanent International Assoc of Road Congresses

Subject/Index Terms

• TRT Terms: Classification; Conferences; Design speed; Freeways; Highway design; Highways; Intercity transportation; Intersections; Layout; Location; Measurement; Speed; Topography; Traffic flow; Travel
• Uncontrolled Terms: Selection
• Geographic Terms: Israel
• Subject Areas: Data and Information Technology; Design; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00481293
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 30 1989 12:00AM