In Portland, Oregon, the Tri-Met transit agency used archived AVL data to reduce variation in run times, improve schedule efficiency, and make effective use of resources.
Transit providers have yet to take advantage of low-cost performance and passenger-activity data associated with AVL-APC technology. This is due, in part, to the traditional separation of operations functions (where the AVL-APC technology has been deployed) from the scheduling and service planning functions of transit organizations (where the needs for data and analysis are located). Pockets of excellent AVL-APC data management for specific applications can be found, but integrated approaches that can be applied across the industry do not exist.
The report, Uses of Archived AVL-APC Data to Improve Transit Performance and Management: Review and Potential, provides a working plan for reviewing the needs, practice, and potential in relation to the use of archived AVL-APC data. Several case studies are presented in the report representing a broad range of transit agencies. Successes as well as failures have been documented in the report.
In Portland Oregon, Tri-Met is a leading example of an agency that has deployed both AVL and APC and has archived AVL-APC data analysis. Their integrated AVL-APC system provides route stop-level records that, for the 65 percent of the fleet, include passenger counts. The data is stored and managed in an Oracle database. Using a query language, selected data (e.g., by route, direction, times, dates) can be extracted. Extracted tables are then imported to statistical analysis software (SAS) for statistical analysis; scripts for standard analyses are stored and reused. Sometimes results are imported to Microsoft Access for easier formatting. The agency has gained a reputation as an industry leader in the areas of data archiving and the application of archived data to performance monitoring and analysis.
Initial performance impacts:
- a 9 percent improvement in on-time performance
- an 18 percent reduction in running time variation
- a 3 percent reduction in mean running time
- a 4 percent reduction in headway variation.
The implementation of the bus dispatch system (BDS) and its AVL/APC components has yielded tangible improvements in service quality and measurable savings in operating and administrative costs at Tri-Met.
Strathman, J.G., et al. "Evaluation of Transit Operations: Data Applications of Tri-Met’s Automated Bus Dispatching System," Transportation Research Board, Transportation Research Record. Washington, DC. 2002.
Author: Furth, Peter G., et al.
Published By: Transporation Research Board, Transit Cooperative Research Program
Source Date: June 2003
Other Reference Number: Web Document No. 23URL: http://onlinepubs.trb.org/onlinepubs/tcrp/tcrp_webdoc_23.pdf?bcsi_scan_AEE9EC396C942F39=0&bcsi_scan_filename=tcrp_webdoc_23.pdf
Average User Rating
Intelligent Transportation Systems > Information Management > Data Archive
Intelligent Transportation Systems > Transit Management > Operations & Fleet Management > Automatic Vehicle Location / Computer-Aided Dispatch
Intelligent Transportation Systems > Driver Assistance > Driver Communication > With Carrier/Dispatch
Typical Deployment Locations
automated vehicle location, computer aided dispatch, automatic vehicle locator, AVL, CAD, AVL/CAD