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Overview of King County Transit Signal Priority Program

Overview of King County Transit Signal Priority Program. T3 Webinar January 22, 2008. Transit Signal Priority Program Timeline. 1991 – Rainier Ave HOV study recommends demonstration of Transit Signal Priority 1993 – Regional Oversight Committee formed

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Overview of King County Transit Signal Priority Program

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  1. Overview of King County Transit Signal Priority Program T3 Webinar January 22, 2008

  2. Transit Signal PriorityProgram Timeline • 1991 – Rainier Ave HOV study recommends demonstration of Transit Signal Priority • 1993 – Regional Oversight Committee formed • 1994-1996 – RFI, RFP, Contract Award • 1997 – System design approved • 1999 – Rainier Ave installation • 2000 – Aurora Ave installation • 2002 – Final acceptance & Aurora Ave evaluation

  3. System Requirements • Conditional priority • Data message • Decentralized operation • Work with multiple signal controller types • Minimal disruption to general Traffic • Limited call frequency • Must serve all phases • No driver interaction

  4. King County TSP System • Detection • RF Tag Reader • 500 - 1,000 feet • Request • TPRG in signal cabinet • Conditional priority

  5. TSP Transponder “Tag” • 128 bit packet: • system • agency • vehicle ID • driver ID • route • run • trip • class • lateness • ridership • No input by driver required. static data dynamic data future use

  6. TSP Reader • RF antenna mounted above roadway • Reader detects tag, reads data packet and passes information to TPR Generator

  7. TPR Generator • Interfaces with traffic controller • Determines if bus is eligible for priority • Stores logs and priority logic

  8. Current TSP Projects • Rainier Avenue • SR 99 North • SR 99 South • Bellevue 8th St. • 272nd / I-5 • Redmond (RITS) • NE 124th St. • Renton TSP • Lake City Way • 1st Avenue South • Jackson St/12th Ave. • E-3 Busway to CBD

  9. Average reduction in bus travel peak period: Average reduction in bus delay at signalized intersections: Reduction in buses with travel time >30 min: 5.5% 25% 40% TSP Evaluation Findings

  10. TSP impacts on reliability are as important as speed Communication quality is critical RFID is effective, but complex and a large share of installation and maintenance cost No one cares more about Transit Signal Priority than Transit TSP Lessons Learned

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