transit priority systems (tps) chun wong, p.e. city of los angeles, department of transportation t3...
TRANSCRIPT
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Transit Priority Systems (TPS)
Chun Wong, P.E.
City of Los Angeles, Department of Transportation
T3 Webinar
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“Smart” Transit Priority System (TPS)
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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
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Project Objectives
Provide schedule adherence Operate within existing street infrastructure Minimize cross street impact Provide bus arrival information Improve transit experience
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Existing Infrastructure
City’s central Urban Traffic Control System (UTCS) - ATSAC
One-second communication poll
Type 2070 traffic controllers
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LA Transit Priority Systems Solution
Transponder
Loop Sensor
2070 Controller
ATSAC Communication Network
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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
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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
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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)
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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
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LADOTTransit Priority Systems (TPS)
Metro Rapid Bus
Metro Orange Line
Passenger Information System
Transit Priority Manager
Mobile Internet Passenger System
Street Embedded Bus Sensor Transponder
Graphics Display
iTRAQ
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Multi-jurisdictional TPS
Countywide BSP (Bus Signal Priority) Program
WiFi 802.11b On-board GPS tracking Distributed system
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BI-Tran 2033 & L.A. TPS
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TPS Map Client Software
Bus Arrival Times Traffic Controller Status
Bus Runtime Info
Animated Bus Icons
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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
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Headway Algorithm
In-house developed High bus frequency service – low headway Leverages Hot List / Run List Time-point propagation (TPP) Load-balanced
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Mobile Internet Passenger Systems (MIPS)
www.rapidbus.net
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TPS Real-Time Data CollectionSignal Priority
Real-time Graphical Displays
Real-time Data Logging
Transit Report And Query (iTRAQ) Web Server
Transit Priority Manager(TPM)
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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
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iTRAQ Web Interfaces
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Lesson Learned
Transit and DOT partnership Existing infrastructure Budget constraint Must / desire features Operating / Maintenance cost