Individual Vehicle Speed Estimation Using Single Loop Inductive Waveforms

Travel time is the reciprocal of speed and is a useful measure of road congestion and traffic system performance. Travel time is also a basic traffic variable that is used in many Intelligent Transportation System (ITS) strategies such as route guidance, incident detection, and traveler information systems. Previously, speeds were mainly acquired from double inductive loops configured as speed traps, since single loop speed estimates based on assumptions of a constant vehicle length were inaccurate. However, more accurate measurements of speed can now be accomplished with single loops by utilizing inductive waveforms of vehicles that are outputed from newer detector cards. An algorithm using signal processing and statistical methods was developed to extract speeds from inductive waveforms. The results show that the proposed algorithm performs better than conventional single loop estimation methods. The results also show that the algorithm is robust under different traffic conditions and is transferrable across surveillance sites without the need for recalibration. The use of the extensive single loop surveillance infrastructure is a cost-effective way of obtaining more accurate network-wide travel time information.

• Record URL:
  https://merritt.cdlib.org/d/ark%3A%2F13030%2Fm5cv7ncv/1/producer%2F42766568.pdf
• Record URL:
  http://www.escholarship.org/uc/item/2zz4b12p
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/42766568
• Corporate Authors:

  University of California, Berkeley

  California PATH Program, Institute of Transportation Studies
  Richmond Field Station, 1357 South 46th Street
  Richmond, CA  United States  94804-4648

  California Department of Transportation

  Division of Research, Innovation and System Information
  1727 30th Street, MS 83
  Sacramento, CA  United States  95816
• Authors:
  • Sun, Carlos
  • Ritchie, Stephen G
• Publication Date: 1991-10

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 31p
• Serial:
  • PATH Working Paper
  • Publisher: University of California, Irvine

Subject/Index Terms

• TRT Terms: Accuracy; Algorithms; Loop detectors; Speed measurement; Travel time; Waveform analysis
• Subject Areas: Data and Information Technology; Highways; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 01584219
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Report/Paper Numbers: UCB-ITS-PWP-99-14
• Files: CALTRANS, TRIS, ATRI, STATEDOT
• Created Date: Dec 29 2015 9:54AM