DISTRIBUTION OF FREE SPEEDS AT TWO-LANE RURAL ROADS . CONFERENCE PAPERS ON THE WORKING DAYS ON TRAFFIC ENGINEERING 1989

VERDELING VAN WENSSNELHEDEN OP TWEESTROOKSWEGEN

Free speeds are defined as the speeds at which vehicles are driven when the drivers are not influenced by other vehicles. In general only some of the drivers in a traffic stream will be able to drive at their free speed. The speeds of the vehicles that drive free are not representative of the distribution of the free speeds of all drivers on the road because the lower free speeds are over represented. Branston has developed a method to estimate the distribution of free speeds from the speeds of free and non-free vehicles on a cross-section. It was found that this method is identical with the statistical estimation technique using censored observations, the product limit method. The method has been evaluated by using two simple simulation models and is applied to data from high flow two-lane rural roads. It was found that a large part of the free speeds are higher than the speed limit. Free speeds in rush hours tend to be somewhat higher than speeds during the rest of the day. (TRRL)

• Corporate Authors:

  Stichting C.R.O.W.

  Galvanistraat 1
  Ede,   Netherlands 
• Authors:
  • Botma, H
• Publication Date: 1989-5

Language

• Dutch

Media Info

• Features: References;
• Pagination: p. 79-94
• Serial:
  • Crow Publikatie 23
  • Publisher: Stichting C.R.O.W.

Subject/Index Terms

• TRT Terms: Conferences; Cross sections; Evaluation; Forecasting; Methodology; Physical distribution; Simulation; Speed; Traffic flow; Traffic lanes
• Uncontrolled Terms: Two
• Geographic Terms: Netherlands
• ITRD Terms: 8525: Conference; 6404: Cross section; 9016: Distribution (gen); 9020: Evaluation (assessment); 132: Forecast; 9102: Method; 8078: Netherlands; 9103: Simulation; 5408: Speed; 671: Traffic flow; 2827: Traffic lane; 9082: Two
• Subject Areas: Freight Transportation; Highways; Operations and Traffic Management; Planning and Forecasting;

Filing Info

• Accession Number: 00499086
• Record Type: Publication
• Source Agency: Institute for Road Safety Research, SWOV
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM