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Transit Priority Systems (TPS)
Chun Wong, P.E.
City of Los Angeles, Department of Transportation
T3 Webinar
“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
Project ObjectivesProvide schedule adherenceOperate within existing street infrastructureMinimize cross street impactProvide bus arrival informationImprove transit experience
Existing InfrastructureCity’s central Urban Traffic Control System (UTCS) - ATSACOne-second communication pollType 2070 traffic controllers
LA Transit Priority Systems Solution
Transponder
Loop Sensor
2070 Controller
ATSAC Communication Network
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
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
Preemption ≠
Signal Priority Preemption
Interrupt signal operationsR x R crossingsEmergency vehicles
Signal PriorityModify signal operationsMaintain coordinationBorrowed time (10% of cycle length)
Priority TreatmentsEarly green
Vehicle detection requiredRed truncation
Green extensionVehicle detection requiredExtend green phaseMost efficient priority
Call PhaseLeft/Right turns
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
Multi-jurisdictional TPSCountywide BSP (Bus Signal Priority) ProgramWiFi 802.11bOn-board GPS trackingDistributed system
BI-Tran 2033 & L.A. TPS
TPS Map Client Software
Bus Arrival Times Traffic Controller Status Bus Runtime Info
Animated Bus Icons
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
Headway Algorithm
In-house developedHigh bus frequency service – low headwayLeverages Hot List / Run ListTime-point propagation (TPP)Load-balanced
Mobile Internet Passenger Systems (MIPS)
www.rapidbus.net
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)
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
iTRAQ Web Interfaces
Lesson Learned
Transit and DOT partnershipExisting infrastructureBudget constraintMust / desire featuresOperating / Maintenance cost