implementation transit priority system and mobile internet passenger system in the city of los...
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Implementation Transit Priority System Implementation Transit Priority System and Mobile Internet Passenger System in and Mobile Internet Passenger System in the City of Los Angelesthe City of Los Angeles
Kang Hu and Chun Wong
City of Los Angeles
Department of Transportation
Presentation at the ITS America’s 2007 Annual Meeting
June 4, 2007
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Metro Rapid System MapMetro Rapid System Map
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Metro Rapid ProgramMetro Rapid Program
4 new lines per year Completed Metro Rapid lines (17 corridors)
o Wilshire-Whittiero Venturao South Broadwayo Vermonto Florenceo Van Nuyso Crenshawo Soto
o Vernon-La Cienegao Hawthorneo Hollywd-Fairfax-Pasadenao Beverlyo Lincolno Westerno Resedao Santa MonicaoLong Beach
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Metro Rapid ProgramMetro Rapid Program
Future Rapid Lines
o Sepulveda (north)o Centralo San Fernando-Lankershimo Pico o West Olympico Garvey-Chavez
o Manchestero San Fernando (south)o Sepulveda (south)o Torrance-Long Beach
With a goal of 27 corridors by end of 2008
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Metro Orange Line BuswayMetro Orange Line Busway
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Metro Orange Line Balboa StationMetro Orange Line Balboa Station
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LADOT’s Transit Priority System (TPS)LADOT’s Transit Priority System (TPS)
A centralized signal priority system Fully integrated with the City’s Adaptive
Traffic Control System (ATCS) Reduce bus delays at signalized
intersections with minimal impacts on cross streets – “smart” priority
Provide real-time bus arrival information Track bus performance throughout the
system
TPS Physical ArchitectureTPS Physical Architecture
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Bus DetectionBus Detection
Selected loop-transponder based on field tests of 3 different technologies
Inductive loops placed in the roadway serve as antennas to receive bus transponder identification code
Advance (check-in) detector just past upstream bus stop
Release (check-out) detector just prior to limit line or within the intersection
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Bus TransponderBus Transponder
Transponder
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Street Embedded Loop SensorStreet Embedded Loop Sensor
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Sensor CardSensor Card
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Model 2070 Traffic ControllerModel 2070 Traffic Controller
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Bus Priority OperationBus Priority Operation
EARLY GREEN - Phase is started earlier than normal to minimize delays to stopped or approaching buses
GREEN EXTENSION - Phase continues past normal endpoint to help buses pass through critical intersections
PHASE HOLD - Phase held in green until bus arrives, typically used for left turns.
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Normal CycleNormal Cycle
45%
35%
20%Main Street
CrossStreet
Left Turns
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Early Green CycleEarly Green Cycle
55%
30%
15%
Main Street
Cross Street
Left Turns
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Green Extension CycleGreen Extension Cycle
55%30%
15%
Main Street
CrossStreet
Left Turns
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Central System ArchitectureCentral System Architecture
2070 Controller
2070 Controller
2070 Controller
Comm.Network
TPS Server(Transit Priority Manager)
LAN/WAN
TPS Workstation
SensorInputSensorInputSensor
Input Database
Web Server
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LADOT’S ATSAC Control CenterLADOT’S ATSAC Control Center
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MTA’S Bus Dispatch CenterMTA’S Bus Dispatch Center
Monitor bus performance
Radio communication with bus operators
Real time bus data provided by LADOT
ATSAC video & camera control access
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TPS Map Client SoftwareTPS Map Client Software
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TPS Real-Time Data CollectionTPS 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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iTRAQ Web InterfaceiTRAQ Web Interface
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TPS ReportsTPS Reports
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Bus Travel Time AnalysisBus Travel Time Analysis
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TPS Performance BenefitsTPS Performance Benefits
Analyzed more than 2000 bus trips and run time data along the corridors
The Metro Rapid Buses achieved a 25% reduction in total travel time
Transit Priority System alone contributed to 30% of the total travel time saving
Bus delays at signalized intersections were reduced by 33-39%
Minimal impacts on cross street traffic
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Impacts on Cross TrafficImpacts on Cross Traffic
Average of 1 second per vehicle per cycle increase in delay to the cross traffic
Change was measured over three time periods: AM, midday and PM peaks
The Level of Service did not change as a result of the Transit Priority System
At some locations timing was changed to provide additional cross street green time
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Passenger Information SystemPassenger Information System
Developed by LADOT
Based on bus detection
Uses actual travel time
Accurate to 1 min
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Mobile Internet Passenger Systems Mobile Internet Passenger Systems (MIPS)(MIPS)
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Mobile Internet Passenger SystemsMobile Internet Passenger Systems www.rapidbus.netwww.rapidbus.net
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Lessons LearnedLessons Learned
Start with a demonstration project first before full implementation
Use proven technologies and keep it simple
Design to minimize impacts on cross street traffic
Do not underestimate the local controller software work and the interface with existing traffic control systems
Be ready to compromise on bus stop locations