Accuracy and Precision of the Transit Tracker System

The accuracy and the precision of Transit Tracker, the Internet- and telephone-based real-time arrival information system of the Tri-County Metropolitan Transportation District of Oregon (TriMet), are analyzed. Although Transit Tracker estimates the arrival times of both bus and rail vehicles, this analysis is limited to bus vehicles. Archived data from TriMet’s automatic vehicle location (AVL) and automatic passenger counter systems were used to compare actual bus arrival times with Transit Tracker estimates drawn from logs created in the estimation process. Accuracy was evaluated primarily by calculating the mean of the difference between the actual bus arrival times and the arrival times estimated by Transit Tracker. Precision was determined largely by the degree of variation in the estimates and measured by the standard deviation of the difference between the actual bus arrival times and the arrival times estimated by Transit Tracker. Finally, an arrival estimation error model was developed to test the effects of a series of factors on the degree of estimation error.

• Record URL:
  • https://doi.org/10.3141/1992-11
• 
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=Accuracy+and+Precision+of+the+Transit+Tracker+System&author=D.+Crout&publication_year=2007
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309104180
• Authors:
  • Crout, David T
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 93-100
• Monograph Title: Transit: Management, Technology, and Planning
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 1992
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Accuracy; Automatic vehicle location; Bus transit; Bus transportation; Passenger counting; Precision; Public transit; Rail transit; Real time information; Tracking systems
• Identifier Terms: Tri-County Metropolitan Transportation District of Oregon
• Uncontrolled Terms: Arrival times; Automated passenger counters
• Subject Areas: Highways; Motor Carriers; Operations and Traffic Management; Planning and Forecasting; Public Transportation;

Filing Info

• Accession Number: 01049298
• Record Type: Publication
• ISBN: 9780309104180
• Files: TRIS, TRB, ATRI
• Created Date: May 8 2007 12:42PM