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Overview of Transit Signal Priority Program in King County. Prepared by Transit Signal Priority Unit. Transit Speed & Reliability Program.
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Transit Signal Priority Unit
The Speed & Reliability Program at King County Metro makes capital improvements designed to improve transit performance. Most projects are in partnership with local cities, and are coordinated with larger projects. Typical improvements include:
Transit Signal Priority
Transit Priority Request System
Tag Interface Unit for Dynamic Data
Participate in selection, approval and design of TPR installations
Approve the TSP Operating Plan
Establish transit priority control strategy that will be implemented
Insure that its traffic control system has the required functionality
Propose location for TPR equipment and develop draft TSP Operating Plan
Support traffic engineer in evaluation/selection of TSP. compatible traffic control equipment
Lead final design effort or approve final PS and E documents for TPR systemRoles and Responsibilities in Initial TSP Implementation
Establish frequency with which buses can request priority
In future, further discriminate calls based on passenger loads and schedule adherence
Set “budget” for green time for buses within signal timing plans
Determine which vehicles/trips will be eligible for performance
After initial activation, monitor system performance and request adjustments from traffic engineer as needed
Update transit operation plan if required.Roles and Responsibilities in Initial TSP Implementation - continued
Optimize signal timing prior to initial implementation of TSP.
Assist in testing and acceptance of TPR system
Assist in evaluation and adjustment of initial TSP settings
Lead the testing and acceptance effort for all new TPR installations
Provide system integration support
Lead effort to evaluate and adjust initial TSP settingsRoles and Responsibilities in Initial TSP Implementation - continued
Coordinate future changes in signal timing that impact TSP intersections with transit agency
Review all proposed TSP. adjustments; accept and implement, or modify, or reject
Participate in the TSP Regional Oversight Committee
Support continued development of TSP. Functionality in traffic control system
Responsible for ongoing TSP system evaluation
Propose adjustments to TPR settings set by city or to TSP traffic control strategies employed by city
Convene regular meetings of a TSP Regional Oversight Committee composed of users to guide continued system development, including enhanced functionality.Roles and Responsibilities in TSP Operation - ongoing
Owns and maintains all TPR equipment in the street, including communication links
Responsible for power for street equipment
Coordinates repairs with transit agency in agreed upon response time
Maintain TPR equipment consistent with configuration management plan
Owns and maintains all aspects of the TPR system from the modem back to the server.
Maintain system access for all participants; serves as network administrator
Monitor system and notify traffic jurisdictions when field equipment is not functioning
Responsible for developing and implementing a configuration management planRoles and Responsibilities in TPR Maintenance - ongoing