THE STATISTICAL PROPERTIES OF FREEWAY TRAFFIC

The results of statistical analysis of the headway-speed variables in freely flowing freeway traffic are presented. The data base consists of trajectories constructed from aerial photographs of the Long Island Expressway. The conclusions are that headways, both space and time, are usually independent, and have an exponential distribution past the small values. Speeds are highly correlated, and have a normal distribution. Speeds and headways are independent except at the highest flow rates. /Author/TRRL/

• Corporate Authors:

  Pergamon Press, Incorporated

  Maxwell House, Fairview Park
  Elmsford, NY  United States  10523
• Authors:
  • BREIMAN, L
  • Lawrence, R
  • Goodwin, D
  • Bailey, B
• Publication Date: 1977-8

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 221-228
• Serial:
  • Transportation Research /UK/
  • Volume: 11
  • Issue Number: 4
  • Publisher: Pergamon Press, Incorporated

Subject/Index Terms

• TRT Terms: Aerial photography; Databases; Exponential distributions; Freeways; Headways; Mathematical analysis; Normal distributions; Speed; Statistical analysis; Traffic flow; Trajectory; Variables; Vehicle trajectories
• Geographic Terms: United States
• ITRD Terms: 4006: Aerial photography; 6471: Analysis (math); 685: Headway; 2752: Motorway; 5408: Speed; 671: Traffic flow; 8122: USA; 9086: Variability
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00168139
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jun 28 1978 12:00AM