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Transit Priority Systems (TPS)

Learn how the City of Los Angeles' Department of Transportation leverages Transit Priority Systems (TPS) to enhance bus performance and rider experience. The project aims to provide schedule adherence, reduce travel time, and deliver bus arrival information using advanced technology.

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Transit Priority Systems (TPS)

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  1. Transit Priority Systems (TPS) T3 Webinar Chun Wong, P.E. City of Los Angeles, Department of Transportation

  2. “Smart” Transit Priority System (TPS) = + +

  3. Project Overview • LADOT partnered with LA Metro in National Bus Rapid Transit (BRT) Demonstration Program since 2000 • Wilshire/Whittier & Ventura • Strong Mayor commitment to improve LA transit services • Improve bus run time performance • Improve ridership • Successfully implemented 18 Metro Rapid bus corridors and the Metro Orange Line • Reduced 25% total travel time

  4. Project Objectives • Provide schedule adherence • Operate within existing street infrastructure • Minimize cross street impact • Provide bus arrival information • Improve transit experience

  5. Existing Infrastructure • City’s central Urban Traffic Control System (UTCS) - ATSAC • One-second communication poll • Type 2070 traffic controllers

  6. LA Transit Priority Systems Solution 2070 Controller Transponder Loop Sensor ATSAC Communication Network

  7. TPS Components • Inductive loop/transponder detection • Low frequency hockey puck liked transponder • Curb-to-curb elongated loop sensor • Model 2070 traffic controller • Check-in / Check-out detection • ATSAC communication network

  8. Transit Priority Manager • Centralized System • PC based server • Real-Time • Track vehicle positions • Determine late/early • Issue signal priority • Calculate bus arrival • Publish bus data • Retrieve and data logging • Implement TOD headway plan • Non Real-Time • Archive to database for trip analysis

  9. Preemption ≠ Signal Priority • Preemption • Interrupt signal operations • R x R crossings • Emergency vehicles • Signal Priority • Modify signal operations • Maintain coordination • Borrowed time (10% of cycle length)

  10. Priority Treatments • Early green • Vehicle detection required • Red truncation • Green extension • Vehicle detection required • Extend green phase • Most efficient priority • Call Phase • Left/Right turns

  11. LADOTTransit Priority Systems (TPS) Street Embedded Bus Sensor Transponder Metro Rapid Bus iTRAQ Transit Priority Manager Graphics Display Metro Orange Line Mobile Internet Passenger System Passenger Information System

  12. Multi-jurisdictional TPS • Countywide BSP (Bus Signal Priority) Program • WiFi 802.11b • On-board GPS tracking • Distributed system

  13. BI-Tran 2033 & L.A. TPS

  14. TPS Map Client Software Animated Bus Icons Traffic Controller Status Bus Arrival Times Bus Runtime Info

  15. Passenger Information System • Real-time data • Integrated with TPM • ETA Count down • Lead bus’ travel time • LED Displays • Communication • CDPD wireless by AT&T • Obsolete • Coverage • Hard-wired FSK (Frequency Shift Keying) • Traffic control device

  16. Headway Algorithm • In-house developed • High bus frequency service – low headway • Leverages Hot List / Run List • Time-point propagation (TPP) • Load-balanced

  17. Mobile Internet Passenger Systems (MIPS) www.rapidbus.net

  18. TPS Real-Time Data Collection Signal Priority Transit Priority Manager (TPM) Real-time Data Logging Transit Report And Query (iTRAQ) Web Server Real-time Graphical Displays

  19. i Transit Report And Query • Leverages existing TPS architecture • Field equipment (Loop/Transponder AVL, 2070 Controller, etc.) • Automates 24 x 7 transit trip data collection • Weekdays; weekends; holidays; rainy days, etc. • Uses commercially standardized Relational Database system (RDBMS) • Oracle Database System • Publishes through Web Server • Simplify RDBMS data access • Client workstations request no complicated ODBC and/or RDMBS setup • In-house developed web application • Microsoft IIS 6.0 • Performance Measure Tool

  20. iTRAQ Web Interfaces

  21. Lesson Learned • Transit and DOT partnership • Existing infrastructure • Budget constraint • Must / desire features • Operating / Maintenance cost

  22. The End Questions & Comments Send questions to: Email: chun.wong@lacity.org

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