USING TIME-SERIES DESIGNS TO ESTIMATE CHANGES IN FREEWAY LEVEL OF SERVICE, DESPITE MISSING DATA

Until recently, time-series designs have seen little use in evaluating freeway management schemes, but the automatic collection of freeway traffic flow data by permanent detectors now makes such analyses feasible. Since detector failures and other factors may produce data gaps in a series, practical, general models must permit multivariate estimation despite some missing data points. Recent developments in time-series analysis make this possible. Using time-series regression analyses (Harvey and Philips, 1979: Jones 1985), it is possible to detect relatively small average changes in traffic flow characteristics, such as peak hour volume and lane occupancy. These can then be related to the freeway's level of service. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09658564
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Davis, G A
  • Nihan, N L
• Publication Date: 1984-10-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 431-438
• Serial:
  • Transportation Research Part A: Policy and Practice
  • Volume: 18
  • Issue Number: 5/6
  • Publisher: Elsevier
  • ISSN: 0965-8564
  • Serial URL: http://www.sciencedirect.com/science/journal/09658564

Subject/Index Terms

• TRT Terms: Data collection; Design; Detection and identification; Detectors; Failure; Freeways; Highway traffic control; Lane occupancy; Level of service; Mathematical models; Peak hour traffic; Regression analysis; Sensors; Speed; Time series; Traffic density; Traffic flow; Traffic volume; Vehicle detectors
• Uncontrolled Terms: Modifications
• ITRD Terms: 8623: Data acquisition; 9115: Detection; 5520: Failure; 653: Level of service; 6473: Mathematical model; 9048: Modification; 2752: Motorway; 6588: Regression analysis; 6120: Sensor; 5408: Speed; 673: Traffic concentration; 671: Traffic flow
• Subject Areas: Data and Information Technology; Design; Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00399421
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Aug 25 2004 2:43AM