Evaluation of dual-loop data accuracy using video ground truth data

Details

• Alternative Title:
  Dual loop error
• Creators:
  Nihan, N. L. ; Zhang, XuDong ; Wang, Y.
• Corporate Creators:
  Washington State Transportation Center ; Washington State Transportation Commission ; Transportation Northwest Regional Center X (TransNow) (UTC) ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Automatic data collection systems
  • Video cameras
  • Evaluation
  • Data quality
  • Data recorders
  • Advanced traffic management systems
  • Algorithms
  • Data acquisition
  • Electronic monitoring systems
  • Error detection codes
  More +
• Publication/ Report Number:
  WA-RD 535.1 ; TNW2002-02
• Resource Type:
  Research Paper
• Geographical Coverage:
  Seattle (Washington)
• Edition:
  Research report
• Corporate Publisher:
  Washington State Transportation Center
• Abstract:
  Washington State Department of Transportation (WSDOT) initiated a ; research project entitled “Monitoring Freight on Puget Sound Freeways” in September ; 1999. Dual-loop data from the Seattle area freeway system were selected as the main data ; source for this project. However, preliminary verification tests performed on the dualloop ; data indicated that the data were not reliable; therefore, the truck movements ; estimated by the dual-loop detectors on the Seattle FLOW system failed to represent the ; real freight activities. Consequently, a part of the WSDOT freight project had to be ; shelved. ; If sufficiently accurate, dual-loop detectors can be very cost-effective collectors ; of real-time vehicle-classification and speed data. This report describes a ; WSDOT/TransNow-funded study that addresses the problems with the existing detection ; system encountered by the original freight study, and recommends remedial actio ns to ; rectify these problems. The researchers 1) investigated the level of inaccuracies in the ; existing WSDOT dual- loop freeway detectors, 2) identified the types and potential causes ; of these inaccuracies, and 3) proposed methods to effectively improve the quality of the ; dual-loop data. ; The objectives of the project were to 1) identify a station of good dual-loop ; detectors to represent the WSDOT system, 2) quantitatively analyze the data collected ; from the selected station and determine the accuracy of the sample dual-loop ; measurements for vehicle volumes and vehicle classifications, 3) identify the types and ; potential causes of the observed inaccuracies, and 4) recommend appropriate methods to ; improve overall dual-loop data quality.
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• Format:
  PDF
• Funding:
  Agreement T1803. Task 38
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/5215/dot_5215_DS1.pdf
• File Type:
  [PDF - 149.58 KB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:85db2e2ba60585773a4b711aabc3386934c12919fc3f3db3ed1a6904b9d4789b