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

The End

Questions & Comments

Send questions to:Email: chun.wong@lacity.org