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Transit Signal Priority (TSP): Deployment Issues and R&D Needs as Identified by Practitioners. Hallie Smith <rhfsmith@mindspring.com> Brendon Hemily <brendon.hemily@sympatico.ca>. What is TSP?. Definition:

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transit signal priority tsp deployment issues and r d needs as identified by practitioners

Transit Signal Priority (TSP): Deployment Issues andR&D Needsas Identified by Practitioners

Hallie Smith

<rhfsmith@mindspring.com>

Brendon Hemily

<brendon.hemily@sympatico.ca>

what is tsp
What is TSP?

Definition:

  • TSP is an operational strategy that facilitates the movement of in-service transit vehicles, either buses or streetcars, through traffic-signal controlled intersections.

An Overview of Transit Signal Priority

ITS America, 2001

signal priority in the u s

Operational

Implementation

Planned

16

7

33

Signal Priority in the U.S.
  • Agencies with Transit Signal Priority
  • 70% of transit properties with over 100 vehicles in North America are implementing/planning TSP (CUTA, 2000)
  • Recent Implementations.
    • Los Angeles, CA
    • Portland, OR
    • Pierce County, WA
    • Atlanta, GA
    • King County, WA

(Volpe, 1999)

bus rapid transit and signal priority
Bus Rapid Transit and Signal Priority
  • BRT Major Initiative in the U.S.
    • Combines the quality of rail transit (speed, reliability) with the flexibility of buses
    • BRT Consortium (11 demonstration sites, 6 other)
    • Signal Priority is a Major Component (14 of 17)
    • TSP Benefits are significant
    • Research is ongoing
benefits
Benefits
  • Reduced Intersection Delay (20 - 40%)
  • Total Travel Time Savings (5 - 8%)
  • Improved Service Reliability
  • Leads to Savings in Vehicle Requirements
  • Improves Customer Satisfaction
  • Small Negative Impacts on Traffic
an overview of transit signal priority
“An Overview of Transit Signal Priority”
  • Report prepared jointly by ATMS (Traffic) and APTS (Transit) Committees of ITS America
  • Contents:
    • Fundamentals
    • Benefits and Costs
    • Issues: Planning, Implementation, Operations
  • Published in 2001 and downloadable from ITS America web site
tsp deployment issues project
TSP Deployment Issues Project
  • Sponsored by FTA and JPO and conducted by ITS America
  • Technical Workshop on TSP Research Needs and Guidance to FTA
    • Practitioners, Researchers, Consultants, Suppliers
    • Over 50 R&D topics identified
tsp deployment project ctd
TSP Deployment Project (ctd)
  • 3 Regional workshops to encourage deployment

(Tucson, Chicago, Hartford)

    • Morning - Industry experts provide technical presentations
    • Afternoon – Breakout groups address local issues and create Action Plans
  • Update of Overview document
tsp deployment general issues
TSP Deployment: General Issues

Significant benefits, but many issues:

  • Confusing array of technical choices: detection, communications, control strategies, integration with other systems
  • Complex organizational issues in multi-agency and multi-jurisdictional setting
  • Need better guidance to navigate choices and issues
  • Lack of standardized reporting on impacts and benefits to allow comparisons
  • Practical information hard to obtain by practitioners
  • All simulation and optimization tools, and traffic controllers are not well suited for TSP
tsp strategic questions raised by workshop participants
TSP Strategic QuestionsRaised by Workshop Participants
  • What are goals and objectives for TSP?
  • Is TSP part of regional plans, or BRT corridors?
  • How to choose where it should be implemented?
  • Should TSP be combined with physical priority (bus lanes, queue jumps, etc.)?
  • How to design TSP system:
    • unconditional vs. conditional?
    • centralized vs. decentralized control?
    • strategies (green extension, red truncation, etc.)?
    • integration with EMS pre-emption
    • detection and communication technologies?
how to assess potential benefits and impacts of tsp
How to Assess Potential Benefits and Impacts of TSP?
  • What should be standard TSP measures of effectiveness?
  • What has been experience elsewhere with TSP?
  • Do we have TSP simulation and optimization tools to measure impacts?
  • Is traffic controller equipment TSP-compatible?
  • Do ITS standards exist for TSP?
  • How does TSP relate to MUTCD and Transit Capacity Manuals?
questions for transit agency
Questions for Transit Agency
  • How to build a solid partnership with traffic counterparts?
  • Should TSP be integrated with AVL or other ITS transit systems (new and/or retrofit)?
  • How to address near-side stops?
  • Can transit scheduling take advantage of TSP?
transit signal priority areas where r d is needed to encourage deployment
Transit Signal Priority:Areas Where R&D is Needed to Encourage Deployment
  • TSP Strategic Choices and Guidance
  • Effective Utilization by Transit Agencies
  • Improved Planning of TSP (especially BRT)
  • Enhanced Analytic Tools (e.g. Simulation and Optimization)
  • Technical Enhancements for Conditional Priority
  • TSP Deployment Evaluation
future
Future
  • Continued deployments (especially BRT)
  • Signal Control & Prioritization Standards
    • NTCIP 1211
    • TCIP TWG 10
  • Review of updated Overview document
  • Future research and dissemination initiatives
thank you
Thank You!

Documents, R&D Needs, presentations from the TSP Deployment Project are posted at:

www.itsa.org/tsp.html