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Development of Standards for Transit Priority

Development of Standards for Transit Priority. Paul R. Olson, P.E. PTOE FHWA Western Resource Center. The only reason God was able to create the Universe in six days was because He didn’t have to worry about the installed base. - Enzo Torresi.

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Development of Standards for Transit Priority

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  1. Development of Standards forTransit Priority Paul R. Olson, P.E. PTOE FHWA Western Resource Center

  2. The only reason God was able to create the Universe in six days was because He didn’t have to worry about the installed base. - Enzo Torresi The nice thing about standards is that there are so many to choose from. - Andrew Tanenbaum Quick Quotes

  3. Reminder These ARE Communications Standards They ARENOT Hardware Standards

  4. Why? • Cross-boundary operations • Many systems involved • Multiple agencies • Different points of view • Evolving systems • Open systems

  5. What Systems

  6. Common Understanding • Two different points of view • Many different goals • Two different sets of terms • Many potential pieces to standardize

  7. Legacy Issues • Incompatibilities in current systems • Glacial change • Market forces • Vendor politics • Standards Development Organizations • Who is in charge?

  8. Vehicle Location Speed Door & Lift Status Predictions Passenger Counting Stop Location Near side Far side Vehicle Routing Stopping Turning Schedule Adherence Vehicle Identification Transit Priority Data Needs

  9. Transit Management Center • Location Monitoring • Schedule Information • Desired Headway • Ridership Monitoring • Other

  10. Traffic Signal • Systems Monitoring • Services request for priority • Resolve conflicting priority requests • Recovery from priority request

  11. Traffic Management Center • Signal System Management • Signal Coordination • Signal Timing • Feedback

  12. SCP Logical System Model

  13. Scenario 1

  14. Scenario 1 Examples • Los Angeles, CA • Buses use loop detectors to communicate to the transit management center • Transit management center determines whether to grant priority • Central system sends messages to the local controllers and adjusts timing accordingly

  15. Scenario 2

  16. Scenario 2 Examples • Montgomery County, MD • AVL System communicates to a central traffic signal system • Central system sends messages to the local controllers and adjusts timing accordingly

  17. Scenario 3

  18. Scenario 3 Example

  19. Scenario 4

  20. Scenario 4 Example • Portland, OR • AVL System on bus determines whether to provide priority (based on criteria) • Bus sends signal directly to traffic signal to request priority

  21. Who Is The Development Team? • Subject matter experts • Infrastructure owners & users • Transportation professionals • Communications experts • Equipment manufacturers • Automobile manufacturers • Information service providers • Public Safety Officials

  22. What and Who?

  23. ITE, NEMA, AASHTO • NTCIP Standards • Actuated Signal Controllers NTCIP 1202 • Signal Control Priority NTCIP 1211

  24. Transit PRG

  25. APTA • Formerly NTCIP 14xx Suite • Now TCIP V 2.4 • New group for Signal Control Prioritization is TCIP Technical Working Group #10 • Standards for a Priority Request Generator

  26. Status • NTCIP 1211 • User Comment Draft released • Revisions now at Version 33 • To final Ballot CY 2004 • APTA TCIP • Start from old NTCIP 14xx documents • Now at Version 2.4 • Final Version will be 3.0 Due out 2005

  27. Questions

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