Transit Priority Systems - Transportation · Transit Priority Systems (TPS) Chun Wong, P.E. ... T3...
Transcript of Transit Priority Systems - Transportation · Transit Priority Systems (TPS) Chun Wong, P.E. ... T3...
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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 OverviewLADOT partnered with LA Metro in National Bus Rapid Transit (BRT) Demonstration Program since 2000
Wilshire/Whittier & VenturaStrong Mayor commitment to improve LA transit servicesImprove bus run time performanceImprove ridershipSuccessfully implemented 18 Metro Rapid bus corridors and the Metro Orange LineReduced 25% total travel time
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Project ObjectivesProvide schedule adherenceOperate within existing street infrastructureMinimize cross street impactProvide bus arrival informationImprove transit experience
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Existing InfrastructureCity’s central Urban Traffic Control System (UTCS) - ATSACOne-second communication pollType 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 detectionLow frequency hockey puck liked transponderCurb-to-curb elongated loop sensor
Model 2070 traffic controllerCheck-in / Check-out detectionATSAC communication network
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Transit Priority ManagerCentralized SystemPC based serverReal-Time
Track vehicle positionsDetermine late/earlyIssue signal priorityCalculate bus arrivalPublish bus data Retrieve and data logging Implement TOD headway plan
Non Real-TimeArchive to database for trip analysis
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Preemption ≠
Signal Priority Preemption
Interrupt signal operationsR x R crossingsEmergency vehicles
Signal PriorityModify signal operationsMaintain coordinationBorrowed time (10% of cycle length)
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Priority TreatmentsEarly green
Vehicle detection requiredRed truncation
Green extensionVehicle detection requiredExtend green phaseMost efficient priority
Call PhaseLeft/Right turns
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LADOT Transit 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 TPSCountywide BSP (Bus Signal Priority) ProgramWiFi 802.11bOn-board GPS trackingDistributed 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 SystemReal-time data Integrated with TPMETA Count downLead bus’ travel timeLED DisplaysCommunication
CDPD wireless by AT&TObsoleteCoverage
Hard-wired FSK (Frequency Shift Keying)
Traffic control device
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Headway Algorithm
In-house developedHigh bus frequency service – low headwayLeverages Hot List / Run ListTime-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
QueryLeverages 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 SystemPublishes 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 partnershipExisting infrastructureBudget constraintMust / desire featuresOperating / Maintenance cost