JOURNEY TIME VARIABILITY IN THE LONDON AREA. 1. JOURNEY TIME DISTRIBUTION

This is the first of three papers presenting research on journey time variability in the London area. It states the objectives of the research, describes the data sources used, and discusses the nature of journey time distribution. The project used a set of representative road journeys, distributed throughout London. Its objectives were to: (1) examine the distribution of journey times; (2) investigate and quantify the factors systematically affecting journey time variability; (3) develop a predictive route-based journey time model; and (4) calibrate and validate the journey time model, using independent journey time data. The first set of data was from a study which aimed to assess the benefits of Autoguide in London, and was based on 100 origin-destination pairs distributed throughout London. The second set was the morning peak home-to-work journeys made by one of the consultants. The third set was from the Highway Reliability Supply Effects study. Histograms were plotted for each set, and show that the journey time distribution is positively skewed. Further statistical analyses and plots were conducted; they suggest that the distribution is closer to a lognormal distribution than to a normal distribution. For Part 2 of this article, see IRRD 892303.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
• Corporate Authors:

  Printerhall Limited

  29 Newmart Street
  London W1P 3PE,   England 
• Authors:
  • Mohammadi, Roozbeh
• Publication Date: 1997-5

Language

• English

Media Info

• Features: References;
• Pagination: p. 250-5,257
• Serial:
  • Traffic Engineering & Control
  • Volume: 38
  • Issue Number: 5
  • Publisher: Hemming Group, Limited
  • ISSN: 0041-0683
  • Serial URL: http://www.tecmagazine.com/

Subject/Index Terms

• TRT Terms: Calibration; Distributions (Statistics); Evaluation and assessment; Forecasting; Mathematical models; Origin and destination; Policy; Travel time; Trip length; Urban areas; Variables
• Geographic Terms: United Kingdom
• ITRD Terms: 6171: Calibration; 6572: Distribution (stat); 9020: Evaluation (assessment); 132: Forecast; 697: Journey time; 6473: Mathematical model; 687: Origin destination traffic; 173: Policy; 8119: United Kingdom; 313: Urban area; 9086: Variability
• Subject Areas: Policy;

Filing Info

• Accession Number: 00740978
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Oct 30 1997 12:00AM