Presentation on theme: "Transit Signal Prioritization (TSP) Considerations within RTS Corridors Rapid Transit System Steering Committee Technical Memorandum 2 Existing Conditions."— Presentation transcript:
1Transit Signal Prioritization (TSP) Considerations within RTS Corridors Rapid Transit System Steering CommitteeTechnical Memorandum 2 Existing Conditions Signal Systems & Corridor OperationsDecember 17th, 2013
2Key Findings10 Route RTS network has 116 stations overlaying 284 existing traffic signals and 820 existing bus stopsImplementing advanced TSP within RTS requires close coordination of existing agencies and systems. Cannot be done in isolation.Existing signal controllers/ central software currently does not support all advanced TSP functionsWould require time and cost to upgrade, cost TBDPrimary traffic control system function is to monitor signal performance for roadway safety and mobilityTSP is a secondary function within overall operationsIncorporating WMATA buses into RTS would require additional hardware and software, cost TBDCouncil resolution shifts TSP decisions based on ROW treatment to Facility Planning stage
3Priority Transit Corridors and Montgomery County Signals Countywide Transit Corridors Functional Master PlanPlanning Board Draft (MNCPPC, July 2013)
5Traffic Signals in Montgomery County by Ownership/Operation & Potential TSP Corridors
6Traffic Signals in Montgomery County by Ownership & Operation 63% Owned by the State of Maryland31% Owned by Montgomery County5% Owned by the City of Rockville91% Operated by Montgomery CountyApproximately 30 of the MDSHA signals in and around Takoma Park & New Hampshire are not operated by the County10 will migrate to County operations in the near future15 are along New Hampshire Avenue (4 outside the County)Majority of the Signals along the RTS routes are owned by MDSHA
7Montgomery County Advanced Transportation Management System (ATMS) Traffic signal operations key component of ATMSTraffic Signal System Modernization Completed in 2012New computer and serversCustom traffic operations and ATMS SoftwareUpgrade of all MDSHA and County traffic signal controllers to modern Econolite ASC/3 controllersHigh speed communications network for real time operationsDistributed signal control system (using the ASC/3 controllers)Each ASC/3 controller is TSP ready (with $400 TSP data key)Developed/tested recommended TSP Architecture:Econolite ASC/3 controllersGTT Opticom GPS Spread Spectrum TSP systemORBCAD Transit Automated Vehicle Location/Computer Aided Dispatch
8Montgomery County Recommended TSP Architecture ATMS Operations CenterTransit ManagementTraffic ManagementATMS Central Operations SoftwareORBCAD Central SoftwareGPSTraffic SIGNALMonitoring and logging dataAVL & Computer Aided DispatchVehicle Tracking& Detection1I Am HEREVehicle is in rangeWho gets PrioritySignal Strategy to usePriority Request Generator2Priority Request Server3ORBCAD Veh. Components: I am LateI Want Priority4GTT OpticomGPS TSP SystemASC/3 Signal ControllerAdjusted phasesIn cycle
9Recommended Countywide TSP Concept of Operations Assumes Current ServiceTransit vehicles in mixed flow without other priority measuresNo differentiation between types of transit serviceTSP Request when bus is more than 5 minutes lateTSP Granted on first come first served basisTSP Signal StrategiesGreen ExtensionEarly GreenSignal coordination allowed to “recover” between instances of signal priority3 cycles between granting requests)
10Issues of Concern to RTS from Current Systems Review (1) Current Montgomery County System can implement:Early green,Extended greenLeading green for queue jumpsOther TSP Signal Strategies will be costly and require changes to the overall system (beyond firmware v 2.50)GTT Opticom GPS TSP SystemRecommended for Montgomery County and WMATAWMATA's recommended system uses different communications.WMATA System in Montgomery CountyNeed cellular modems at the roadside (cabinet) for each signal locationTests to make sure inputs from Ride On and WMATA can work together
11Issues of Concern to RTS from Current Systems Review (2) Automatic Vehicle Location/Computer Aided DispatchRide On ORBCAD AVL/CAD system tested for TSP in Montgomery CountyNot Used by WMATA (Clever Devices)AVL/CAD for RTS needs to be determined.City of RockvilleNo signals operated by Rockville directly on the RTS corridorsTwo signals on CCT right of way Potential for TSP at Rockville signals with diversions to reach special destinations (e.g. Community College)Any integration with the Rockville system will require upgrades to its controllers and/or central software. Integrating Current MTA Commuter Service (provided by contractors with no AVL/CAD) requires added technologyRTS will need to integrate/coordinate with CCT and Purple line.
12RTS ROW Priority Treatments versus TSP Signal Operations * Insert Transit Phase, Phase Rotation, & Phase Suppression would require upgrade of Signal System Software
13Other Characteristics impacting TSP (Turns, Other Service)
14Factors influencing TSP Strategies at Specific Intersections Roadway:Intersection Level of ServiceAvailable green time (slack)Cross street facility typeBicycle & Pedestrian treatments and priority areas,Transit:Other Transit Service in the CorridorCross street transit serviceBus stop/station locationsService frequencyTime between priority requestsRidership
15Overall System and Policy Decisions Needed Can’t determine TSP at specific intersections until facility planning for each corridorCan/Should decide:Integrated or separateOperations centersCommunicationsTSP systems and equipmentTSP Architecture (centralized, distributed, communications, etc.)Recommended TSP by ROW Priority TreatmentTypes of transit service receiving TSP in corridorDecision strategy for enabling TSP and each intersectionConditional parameters (direction, time of day, schedule, passengers, frequency of granting requests)Types of TSP signal strategies to provide forRTS and Purple Line integration
16Technical Memorandum 3, RTS & TSP Findings & Recommendations: What do we have today, what do we want to have in the future?Cost to deploy all add-on TSP configurations within the current signal systemConcept of operations – defined scenarios withRTS vehicles onlyRTS and other transit providers in RTS ROWRTS and conflicting local transit outside RTS ROWRTS and conflicting LRV outside RTS ROWWhat needs to happen for each type of strategy/ ROWTechnology, agency agreements, etc.
18Econolite ASC/3 Controller Controls signal phasing, TSP strategy length of priority, lock out periods (16 phases max)Current advanced controller offered by EcononliteCompatible with Standards (NEMA TS2, NTCIP 2011)1 TSP request addressed per cycle (check in/out or continuous monitoring)TSP ready (with $400 TSP data key)TSP Strategies with current firmware (v 2.45, planned 2.49)Extended greenEarly greenLeading green for queue jumpAdditional features/strategies dependent on firmware v 2.50 and aboveFirmware v 2.50 and above incompatible with ATMS Central Operations Software. Very costly to upgrade
19GTT Opticom GPS TSP System Recommended for Montgomery County existing systemAlso selected by WMATA (with differences) and MDSHA in other areas (for preemption). On MDSHA procurement schedule.Components/functionsOn-vehicle (PRG: sends request when criteria are met)Wayside antennae (spread spectrum) to receive vehicle locationPhase selector (PRS: validate position, in range ?, prioritize/resolve conflicts, send request to controller)Additional central software to provide monitoring and logging data also recommendedProved technically feasible in Route 55 MD 355 TSP testHow to integrate across operating agencies / services remains to be seen
20ORBCAD AVL/CAD SystemAutomatic Vehicle Location and Computer Aided Dispatch system implemented by Ride OnCurrently provided by ACS Systems/Xerox (has gone through several transitions)FunctionsReal time vehicle location and monitoringSchedule and route adherenceData and voice communications (mobile data terminal)Voice annunciation for stops along routesSilent alarmAutomatic Passenger CountsTSP integration to identify late vehicles, passengers, etc.Integration with TSP proven technically feasible in Route 55/MD 355 TSP test.
21City of Rockville Signal System 143 signals within or near Rockville BoardersCity owns 48 signalsCity operates:42 of its own signals6 of the MDSHA signalsEconolite ASC/2 Controllers with limited TSP capabilityAires Closed Loop traffic system with dial up connection (not real time)No City Signals directly on RTS Routes2 City Signals on the CCT corridor
22Ride On Montgomery County Transit (Ride On) Weekday service:78 routes289 peak vehiclesProvides service in every proposed RTS corridorOperations colocated with traffic but not integratedTrapeze bus scheduling and run-cutting softwareSmart Traveler Customer InformationRegional Smart Card Fare PaymentImplementing Automatic Passenger Counters (~ 55%)ORBCAD Avl/Cad systemWill allow Conditional TSP on Schedule Adherence and Passenger LoadsOnly Route 55 TSP vehicles for TSP Test equipped with GTT Opticom GPS TSP systems
23Washington Metropolitan Area Transportation Authority (WMATA) From: A. Young Leveraging the WMATA CoABE Project Technology for TSP Implementation (ITS Maryland, October 2013)Consolidated onboard & fixed end equipment in 2012/2013Clever Devices AVL/CADGTT Opticom TSP software/ hardwareCellular communications with the Intelligent Vehicle Network (IVN) UnitRoadside (cabinet) cellular modem with GPSEconolite ASC3 controller through GTT Phase Selector
24Washington Metropolitan Area Transportation Authority (WMATA) Service140 Metrobuses in peak periods within Montgomery CountyPrimarily regional service along major corridorsWMATA service in every proposed RTS corridorIssuesInstallation, recurring costs, maintenance of cellular modems within Montgomery County signal cabinetsReconciliation/integration between WMATA Cellular and Montgomery County Spread Spectrum vehicle to roadside communication (can inputs be received and integrate from both)Resolving competing priority requests between Montgomery County and WMATA vehiclesCommunication/coordination between operation centers
25Maryland Transit Administration (MTA) Current ServiceRoute Gaithersburg to BWI Marshall AirportRoute Metropolitan Grove to DOD/Ft. MeadeRoute Columbia to BethesdaRoute Frederick to College ParkRoute Columbia/Silver Spring to Washington, DCRoute Columbia/Silver Spring to Washington, DCRoute Hagerstown/Frederick to Shady Grove/Rock Spring Business ParkRoute Clarksville/Ellicott City/Columbia to Washington, DCContract Service with no AVL/CAD or other technology requirementsFuture Systems (will need to coordinate)Purple LineCorridor Cities Transitway (CCT)