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Transit Signal Priority (TSP)

Transit Signal Priority (TSP). Presented by Brian Kemper Manager, Signal Operations Seattle Transportation Department January 13, 2002. Seattle Transportation City of Seattle. Presentation Summary. Overview of TSP in Seattle TSP System & Equipment Signal Controllers & Software.

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Transit Signal Priority (TSP)

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  1. Transit Signal Priority (TSP) Presented by Brian Kemper Manager, Signal Operations Seattle Transportation Department January 13, 2002 Seattle Transportation City of Seattle

  2. Presentation Summary • Overview of TSP in Seattle • TSP System & Equipment • Signal Controllers & Software

  3. Overview of TSP in Seattle • Provides conditional priority rather than emergency preempt • Traffic signal timing and controller software establish conditions for TSP • Currently operates along two corridors and funded for three more

  4. Rainier Ave South:Alaska to 23rd • 5 intersections • 2.1 Miles • Route 7, 7EX, 9 • 250 buses/day • 2 Million patrons/year • ADT 37,000 • Peek LMD 9200 Controllers

  5. Aurora Avenue Segment 1: Winona - N. 105th • 8 intersections • 1.8 Miles • Route 358 • 125 trips/day (10/ peak hour) • ADT 38,000 • Eagle EPAC M340 Controller • Using Check Out Detection

  6. Aurora Segment 2:N 107th to N. 145th St. • 7 intersections • 1.9 Miles • Route 358 • 10 buses/peak hour • ADT 34,000 • Eagle EPAC 300 M340 Controller • HOV lane

  7. TSP System & Equipment • Transponder on bus • Antenna • Reader • Transit Priority Request (TPR) Generator • Signal Controller

  8. and TPR Generator

  9. TSP System Components TPR Generator Tag Antenna Reader Cabinet Tag Interface Unit for Dynamic Data

  10. On-Vehicle Equipment • Amtech radio frequency (RF) transponder tag - 902-928 MHz “Spread-Spectrum” Band • 2.4 GHz optional Field Disturbance Device • Modulated Backscatter Technique

  11. Transponder Data Packet

  12. On-Street Equipment • Antenna • Log-Periodic • Yagi • Longer Range

  13. TPR Reader • Functions: • Detect tag • Acquire tag and validate data • Transfer data to TPR Generator

  14. Transit Priority Request (TPR) Generator • Interfaces with traffic controller • Determines if bus is eligible for priority • If eligible, places a request for priority to traffic controller • Stores and logs priority settings

  15. Traffic Signal Controller • Receives Priority Requests • Contains software for signal functionality • Contains algorithms for TSP

  16. Signal Controllers & Software • controller type • software conditions • algorithm • variable parameters • signal timing plans

  17. Controllers • NEMA based (National Electrical Manufacturing Association) • Contracted with “Peek” (LMD 9200) for TSP software development • Contracted with another company; failed to deliver • Contracted with “Eagle” (EPAC M34) for TSP software development

  18. Software Conditions Green Extension/Red Truncationwhile • staying in coordination • not skipping phases • providing pedestrian clearances • emergency calls override

  19. Algorithm Summary When TPR is received while “green” light is on the priority direction: • checks for adequate clearance time • if adequate, the green is extended • serves non-priority directions with reduced service • if inadequate, the controller quickly serves other directions • then returns to priority street sooner than it otherwise would have

  20. Algorithm Summary (continued) When TPR is received while “red” light is on the priority direction • continues service of non-priority directions • provides a “reduced” service, or time for those directions • serves pedestrians as needed • returns to priority direction sooner than otherwise would have

  21. TSP Variable Parameters Settings: time of day eligible vehicle tables frequency of allowed priority service direction Future: lateness ridership

  22. Signal Timing Plans • Optimized timing plans provide huge benefits • Most local agencies are understaffed • Aurora Ave travel time was improved by 22%! • Other corridors have been improved by 10 - 30%

  23. TSP Key Findings along Rainier Avenue • Bus delay reduced by 34% when bus is eligible for priority service • average reduction in intersection stops for buses is 24% • travel time savings is 8%

  24. Limits of Transit Signal Priority • Primary limitation is based on supply and demand of “green” time • what will the public accept? • Number of eligible buses per intersection • frequency of priority granted • Software can be very flexible • however revisions are time consuming • Cost/Benefit • “smarter” systems cost

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