CALIBRATION OF INTRAS FOR SIMULATION OF 30-SEC LOOP DETECTOR OUTPUT

Since its inception in the early 1980s, the Integrated Traffic Simulation (INTRAS) model has been used in many studies involving freeway corridor traffic simulation. The model was originally calibrated with data collected in the 1970s in Los Angeles. In view of changing traffic conditions during the past decade, the validity of the parameter values as calibrated in the original setting is questionable. In several recent studies that used INTRAS as an evaluation tool, the model has been recalibrated with recent data. However, because of the different applications of the INTRAS model in these studies, the calibrations were made with output averaging at longer time intervals and for different output variables. To simulate traffic operation on Southern California freeways consistent with surveillance data currently being collected by the California Department of Transportation in traffic operations centers, INTRAS has been calibrated with respect to loop detector data at 30-sec intervals. The calibration process involved traffic during conditions with and without incidents, based on data collected along a 5-mi section of a major freeway in Orange County. Key parameters calibrated in this study include car-following sensitivity constants, minimum car-following distance, vehicle lengths, effective detector lengths, and the INTRAS "rubbernecking factor". The calibrated model has been used to simulate detector data for evaluating incident detection algorithms and for training artificial neural network models to detect freeway incidents.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1994/1457/1457-025.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=CALIBRATION+OF+INTRAS+FOR+SIMULATION+OF+30-SEC+LOOP+DETECTOR+OUTPUT&author=R.+Cheu&author=W.+Recker&author=S.+Ritchie&publication_year=1994
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061008
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1457, Part 2, Traffic Flow and Capacity. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Cheu, Ruey Long
  • Recker, Wilfred W
  • Ritchie, Stephen G
• Publication Date: 1994

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 208-215
• Monograph Title: Part 1: 1994 TRB Distinguished Lecture, Adolf D May; Part 2: Traffic flow and capacity
• Serial:
  • Transportation Research Record
  • Issue Number: 1457
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Calibration; Freeways; Traffic data; Traffic simulation; Vehicle detectors
• Geographic Terms: Southern California
• Old TRIS Terms: Detector data
• Subject Areas: Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00677665
• Record Type: Publication
• ISBN: 0309061008
• Files: TRIS, TRB
• Created Date: May 12 1995 12:00AM