TSP Must Fit Within An Overall Agency ITS Plan

Transit Priority Data Needs

• Vehicle Location– Speed

• Door & Lift Status– Predictions

• Passenger Counting

• Stop Location– Near side– Far side

• Vehicle Routing– Stopping– Turning

• Schedule Adherence

• Vehicle Identification

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Let’s Just Look at AVL Systems

Do we want one AVL system that meets all needs,

or multiple AVL systems?

AVL Systems

• GPS• Sign Post (beacon)• Dead Reckoning

• Sign Post + Dead reckoning• GPS + Dead reckoning

AVL Systems

• Does the bus know where the bus is, does the traffic management center know where the bus is, or does some device in the field know where the bus is?

• Information provided• Communication required• Flexibility / content of that message

AVL Systems

• How do you intend to use that information?– Fleet management?– Labor management?– Labor oversight?– Automated control?– Security?

AVL Implementation Issues

• Political• Technical• Institutional• Financial• Legal

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AVL Implementation Issues

• Political – Big Brother– Who gets to know where the bus is?– Who controls that data?– How will that data be used?

• Homeland security?

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AVL Implementation Issues

• Technical– Move to proactive fleet management– Which technology is best?

• Purchase price• Maintenance / operations price• Long term value, including flexibility

– Not really “plug and play” yet– Reliability of communication network

TSP-Related Systems

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Transit Management Center

• Location Monitoring• Schedule Information• Desired Headway• Ridership Monitoring• Service type

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Traffic Management Center

• Signal System Management• Signal Coordination• Signal Timing• Priority Restrictions• Feedback

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Traffic Signal

• Services request for priority• Resolve conflicting priority

requests• Recovery from priority request

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Scenario 1 FleetManagement

Center

TrafficManagement

Center

PriorityRequestServer

PossiblyIntegrated

FleetVehicle

TrafficSignal

Controller

PriorityRequest

Generator

Coordinator

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Scenario 2 TrafficManagement

Center

PriorityRequestServer

PossiblyIntegrated

FleetVehicle

TrafficSignal

Controller

FleetManagement

Center

PriorityRequest

Generator

Coordinator

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Scenario 3

PriorityRequestServer

PossiblyIntegrated

FleetVehicle

TrafficSignal

Controller

FleetManagement

Center

Coordinator

TrafficManagement

Center

PriorityRequest

Generator

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Scenario 4 FleetManagement

Center

TrafficManagement

Center

PriorityRequestServer

PossiblyIntegrated

FleetVehicle

TrafficSignal

Controller

PriorityRequest

Generator

Coordinator

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Logical System Model

PriorityRequest

Generator

PriorityRequestServer

Priority Request

Feed Back

FleetVehicle

FleetOperations

Management

TrafficSignal

TrafficManagement

VehicleInformation

RequestStatus

Criteria

Status

PriorityTiming

Status

Signal TimingParameters

Status

DataExchange

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Driver logs on to DriverDisplay Unit (ID, Rte, Run)

Dynamic data passed to Tagby Tag Interface Unit

Static and dynamic data passedfrom tag to roadside antenna/

reader

Tag data verified and passed toroadside TPR Generator

Static data resident on tag(system, agency, vehicle ID)

No

Lateness, passenger loaddata passed to tag from

AVL, APC (future)

Is route/trip eligible?

Is emergencyvehicle preemption

active?

No

Yes

Driver logs on to DriverDisplay Unit (ID, Rte, Run)

Dynamic data passed to Tagby Tag Interface Unit

Static and dynamic data passedfrom tag to roadside antenna/

reader

Tag data verified and passed toroadside TPR Generator

Static data resident on tag(system, agency, vehicle ID)

No

Lateness, passenger loaddata passed to tag from

AVL, APC (future)

Is route/trip eligible?

Is emergencyvehicle preemption

active?

No

Yes

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Priority request tosignal controller

No priorityrequest to

signalcontroller

Has minimum TPRinterval passed?

Is bus later than X?

Is bus load greaterthan X?

Yes

Yes

Yes

No

Yes

No

No(future capability)

(future capability)

Priority request tosignal controller

No priorityrequest to

signalcontroller

Has minimum TPRinterval passed?

Is bus later than X?

Is bus load greaterthan X?

Yes

Yes

Yes

No

Yes

No

No(future capability)

(future capability)

TSP Implementation Issues

• Confusing array of technical choices: detection, communications, control strategies, integration with other systems

• Complex organizational issues in multi-agency and multi-jurisdictional setting

• Need better guidance to navigate choices and issues

CEE582

More TSP Implementation Issues

• Lack of standardized reporting on impacts and benefits to allow comparisons

• Practical information hard to obtain by practitioners

• All simulation and optimization tools, and traffic controllers are not well suited for TSP

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