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Development of Standards forTransit Priority
Paul R. Olson, P.E. PTOE
FHWA Western Resource Center
Quick Quotes
The only reason God was able to create the Universe in six days
was because He didn’t have to worry about the installed base.
- Enzo Torresi
The nice thing about standards is that there are so many to choose
from.
- Andrew Tanenbaum
Reminder
These
ARE
Communications Standards
They
ARE NOT
Hardware Standards
Why?
Cross-boundary operations
Many systems involved
Multiple agencies
Different points of view
Evolving systems
Open systems
What Systems
Tra nsit M a na g e m e nt C e nte r
Tra ffic Sig na l M a na g e m e nt
C e nte r
Common Understanding
Two different points of view
Many different goals
Two different sets of terms
Many potential pieces to standardize
Legacy Issues
Incompatibilities in current systems
Glacial change
Market forces
Vendor politics
Standards Development Organizations
Who is in charge?
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
Transit Management Center
Location Monitoring
Schedule Information
Desired Headway
Ridership Monitoring
Other
Traffic Signal
Systems Monitoring
Services request for priority
Resolve conflicting priority requests
Recovery from priority request
Traffic Management Center
Signal System Management
Signal Coordination
Signal Timing
Feedback
SCP 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
Scenario 1
FleetManagement
Center
TrafficManagement
Center
PriorityRequestServer
PossiblyIntegrated
FleetVehicle
TrafficSignal
Controller
PriorityRequest
Generator
Coordinator
Scenario 1 Examples
Los Angeles, CA Buses use loop detectors to communicate to the
transit management center Transit management center determines whether
to grant priority Central system sends messages to the local
controllers and adjusts timing accordingly
Scenario 2
TrafficManagement
Center
PriorityRequestServer
PossiblyIntegrated
FleetVehicle
TrafficSignal
Controller
FleetManagement
Center
PriorityRequest
Generator
Coordinator
Scenario 2 Examples
Montgomery County, MD AVL System communicates to a central traffic
signal system Central system sends messages to the local
controllers and adjusts timing accordingly
Scenario 3
PriorityRequestServer
PossiblyIntegrated
FleetVehicle
TrafficSignal
Controller
FleetManagement
Center
Coordinator
TrafficManagement
Center
PriorityRequest
Generator
Scenario 3 Example
Scenario 4
FleetManagement
Center
TrafficManagement
Center
PriorityRequestServer
PossiblyIntegrated
FleetVehicle
TrafficSignal
Controller
PriorityRequest
Generator
Coordinator
Scenario 4 Example
Portland, OR AVL System on bus determines whether to
provide priority (based on criteria) Bus sends signal directly to traffic signal to
request priority
Who Is The Development Team?Subject matter experts Infrastructure owners & users Transportation professionals Communications experts Equipment manufacturers Automobile manufacturers Information service providers Public Safety Officials
What and Who?Tra nsit M a na g e m e nt
C e nte r
Tra ffic Sig na l M a na g e m e nt
C e nte r
ITE, NEMA, AASHTO
NTCIP Standards
Actuated Signal Controllers NTCIP 1202
Signal Control Priority NTCIP 1211
Transit PRG
TransitPriority
RequestGenerator
Passenger CounterTWG 2
(PassengerInformation)
Location InformationTWG 8(Spatial
Representation)
Schedule AdherenceTWG 1
(Scheduling/Runcutting)
Other Information
PriorityRequestServer
SAE Data BusLinks using
TCIPStandards
NTCIP 1211+
DSRC?
APTA
Formerly NTCIP 14xx Suite
Now TCIP V 2.4
New group for Signal Control Prioritization is TCIP Technical Working Group #10
Standards for a Priority Request Generator
Status
NTCIP 1211 User Comment Draft released Revisions now at Version 33 To final Ballot CY 2004
APTA TCIP Start from old NTCIP 14xx documents Now at Version 2.4 Final Version will be 3.0 Due out 2005
Questions
