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Transit Signal Prioritization (TSP) and RTS RTS Transit Signal Priority Work Group. A Path to Successful Implementation. September 18, 2013. Agenda. Review of Technical Memorandum 1: Goals , Objectives, and Needs Assessment for Rapid Transit System (RTS) Transit Signal Priority Next Steps

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Transit Signal Prioritization (TSP) and RTS RTS Transit Signal Priority Work Group

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Transit signal prioritization tsp and rts rts transit signal priority work group

Transit Signal Prioritization (TSP) and RTSRTS Transit Signal Priority Work Group

A Path to Successful Implementation

September 18, 2013


Agenda

Agenda

  • Review of Technical Memorandum 1:Goals, Objectives, and Needs Assessment for Rapid Transit System (RTS) Transit Signal Priority

  • Next Steps

    • Ongoing Stakeholder Interaction

    • Systems Engineering Analysis (ConOps, Policy Recommendations)

    • Technical Memorandum 2: Existing conditions, Signal Systems & Operations on Corridors

    • Technical Memorandum 3: RTS Transit Signal Priority Planning


Technical memorandum 1 needs assessment goals objectives of tsp

Technical Memorandum 1:Needs Assessment & Goals/Objectives of TSP

Table of Contents

  • Introduction

    • Background

    • Montgomery County and the State of Maryland System Responsibilities

    • Organization

  • Overview of Transit Signal Priority

  • The Potential Role of Transit Signal Priority Within RTS

    • Purpose of TSP within the RTS System

    • Goals, Objectives, and Evaluation Measures

    • TSP in Past & Parallel Montgomery County Priority Transit Studies/Projects

    • III.4Differences to consider between Countywide and RTS TSP

  • Stakeholders and Their Needs

  • Policy Issues & Challenges

  • Next Steps


Mncppc functional master plan

MNCPPC Functional Master Plan


Montgomery county countywide tsp study

Montgomery County Countywide TSP Study

  • Carried out a state of the practice/lessons learned assessment on TSP across the country and past operational tests within the region

  • Carried out a technology assessment and selection of recommended equipment for Montgomery County

  • Developed a Concept of Operations for TSP implementation and operations

  • Identified and ranked 18 potential corridors within the county for TSP implementation in the current system based upon inputs from WMATA, RIDE ON, the MTA, and transit and roadway operating characteristics.


Countywide tsp corridors

Countywide TSP Corridors

  • 18 corridors initially identified

  • Over 800 traffic signals maintained by the County

  • Over 350 signals in the selected 18 corridors

  • ~ 200 Intersections selected based upon warrants and then weighting of potential benefits


Countywide tsp study conditional criteria

Countywide TSP StudyConditional Criteria

  • Buses 5 minutes behind schedule.

  • First come first served basis (no special consideration to direction, corridor, operator, or type of service).

  • A TSP request will be granted only when it can be accommodated safely within the traffic signal controller phases at the intersection.

  • TSP signal strategy options

    • green extension

    • red truncation.

  • Lockout after a request is granted (3 cycles)


System responsibilities

System Responsibilities

  • TSP requires collaboration and operating agreements between traffic and transit operations.

  • Montgomery County, The State of Maryland, and the City of Rockville own and operate the traffic signal system.

    • ~ 800 Signals

    • 64% of Signals on State Routes owned by the State

  • Responsible for SAFE operation and overall performance of the signal/traffic system

  • Must obtain approval and agreements from these entities for TSP equipment and operations


What is transit signal priority tsp

What is Transit Signal Priority (TSP)

  • TSP is a traffic signal operational strategy that facilitates the movement of transit vehicles, either buses or streetcars, through traffic signal controlled intersections.

  • Passive TSP adjusts signal timing/coordination for transit operations

  • Active TSP is used to provide passage for transit vehicles at signalized intersections when requested.

  • Conditional TSP requests priority only if certain conditions are met.

Source: TSP Handbook

Active TSPis conditional priority, not to be confused with Emergency Vehicle Preemption which is unconditional priority


Conceptual elements of active tsp

Conceptual Elements of Active TSP


Transit signal priority strategies

Transit Signal Priority Strategies

  • Green Extension

  • Red Truncation

  • Phase suppression/rotation

  • Transit Only Phase

    • Queue Jump (early green)

    • Diagonal Crossing (all red)


Tsp within rts system purpose goal

TSP within RTS SystemPurpose & Goal

  • Purpose: Help maintain consistent transit vehicle flows and travel times for RTS Service while reducing delays due to stops at traffic signals.

  • Goal: Improve expected Transit Travel Times for travelers using the RTS system through improving reliability and reducing delays without undo negative impacts to the overall transportation system performance or other travelers.


Corridor level objectives

Corridor Level Objectives

  • Increase RTS travel speeds by reducing delay at traffic signals:

    • Predicted signal delay (using simulation tools such as VISSIM) for TSP enabled RTS vehicles at intersections and along corridor

  • Increase RTS on‐time performance by reducing travel time variability:

    • Predicted run times (using simulation tools such as VISSIM) for TSP enabled RTS vehicles by type of right-of-way segment along corridor

  • Avoid undo impacts to non-RTS transit performance:

    • Predicted signal delay (using simulation tools such as VISSIM) for thru and crossing non-TSP enabled transit service at intersections and along corridor.

    • Predicted run times (using simulation tools such as VISSIM) for thru and crossing non-TSP enabled transit service by type of right-of-way segment along corridor.

  • Avoid undo impacts to the overall transportation system and other travelers:

    • Intersection Highway Capacity Manual volume to capacity ratio must be less than 1.

    • Available slack time (time remaining after minimum safe green times and pedestrian crossings are met within each phase) at each intersection must be greater than five (5) seconds.

  • Provide an increase in overall person throughput and level of service:

    • Predicted person delay (using simulation tools such as VISSIM) for all travelers at intersections and along corridor (should not increase).

    • Predicted person throughput (using simulation tools such as VISSIM) for all travelers at intersections and along corridor (should increase).


System wide objectives

System Wide Objectives

  • Cost Effective:

    • Benefit Cost Ratio greater than 1.

  • Compatible and Interoperable:

    • Selected on board communications and other technologies that are compatible with existing and planned systems within Montgomery County (Traffic Operations, Ride On, WMATA, The Purple Line, etc.)

    • Selected roadside communications and other technologies that are compatible with transit vehicles that may operate within the RTS corridors (Ride On, WMATA, The Purple Line, MTA Express Service, etc.)

    • Selected network and software systems that interface with existing and planned systems within Montgomery County.

    • Utilize applicable ITS Standards and non-proprietary data formats for all interfaces, dialogs, and data archives.

  • Functional:

    • Meet all needs and functional requirements defined in the Concept of Operations (under development).

    • Include system and subsystem component and software verification and validation tests defined in the Systems Engineering Analysis (and pass these tests during implementation and testing).

    • Include an acceptance validation and refinement period during operations (1 year) to modify parameters and ensure that they system is performing properly prior to final acceptance.


System wide level objectives

System Wide Level Objectives

  • Technically feasible and reliable:

    • All technologies, communications, and software systems have been successfully deployed and accepted in North America.

    • Positive reports on reliability and system performance from other locations where the technologies and systems have been deployed.

  • Able to provide performance measures and reports:

    • Produce measures of TSP effectiveness for TSP enabled RTS vehicles including the vehicle, location, and time of all signal delays, priority requests, and whether the request was granted.

    • Performance measures of TSP impacts for all non-RTS transit service travelling through TSP intersections including stops and delay at the intersection.

    • Performance measures of TSP impacts on the signal system including when TSP is requested, which requests are granted, the type of TSP treatment, and recovery time.

    • Ability to monitor and provide reports (real time, daily, weekly) to the traffic operations center and the transit management center upon request.


Past rts studies countywide bus rapid transit study parson s brinkerhoff july 2011

Past RTS Studies:Countywide Bus Rapid Transit Study (Parson’s Brinkerhoff, July 2011)

  • TSP Limited to green extension and/or red truncation

  • Included Queue Jump Recommendations

  • Where Intersection LOS was C or D


Transit signal prioritization tsp and rts rts transit signal priority work group

Past RTS Studies:RTS Concept Plans and Cost Estimates for the Envisioned System (The Traffic Group, January 2011)

  • Feasibility of high level BRT system with no ROW expansion

  • Upper bound on potential for BRT within ROW

  • Without regard to impacts to the other modes


Ongoing priority transit efforts

Ongoing Priority Transit Efforts

  • The Purple Line

  • The Corridor Cities Transitway

  • The MD 586 (Veirs Mill Road) Bus Rapid Transit (BRT) Study from Rockville Metrorail Station to Wheaton Metrorail Station

  • MD 97 (Georgia Avenue) Bus Rapid Transit (BRT) Study from the Glenmont Metrorail Station to Montgomery General Hospital


Transit signal priority considerations countywide versus rts

Transit Signal Priority ConsiderationsCountywide versus RTS

Countywide – Current Ops

Within RTS – Ops

Future service in tandem with RTS ROW and other priority treatments

How should RTS, Express, Local & peak in or out be given priority?

Corridors from County Transit Functional Master Plan

What service gets priority when there are multiple requests?

Should RTS service get additional priority?

Should signals be coordinated for RTS vehicle flow?

How often should priority be granted?

New Signal treatment Options:

Passive priority

Transit only phase

  • Current service in mixed flow (no other special treatment)

  • All transit in corridor treated equally

  • Corridors selected on most potential transit benefit with least potential traffic harm

  • First come first served transit priority request granted

  • Person throughput auto and transit equal

  • Traffic signals coordinated for all traffic

  • Traffic coordination allowed to recover between requests

  • TSP options:

    • Green extension (through)

    • Truncated red (through or cross)


Stakeholders

Stakeholders

  • Stakeholders considered:

    • System Users

    • Traffic System Owner/Operators

    • Transit System Owner/Operators

    • Planning Organizations

    • Funding Bodies

    • Neighboring Jurisdictions

  • Groups not considered:

    • Advocacy Groups

    • Consultants

    • technology/system providers


Transit signal prioritization tsp and rts rts transit signal priority work group

Stakeholder Needs/Concerns (See Handout)


Policy issues challenges

Policy Issues & Challenges

  • Traveler Preferences and Weights.

    • Person Trips versus Vehicle Trips

    • Who shares ROW

    • Who can request Priority

    • Which intersections

    • How often will requests be granted

    • What monitoring is needed

  • Equipment Compatibility and Functionality

  • Independent or Integrated Operations.


Next steps

Next Steps

  • Ongoing interaction with the RTS TSP stakeholders

  • Ongoing collaboration with the Service Planning and Integration Work Group

  • Systems Engineering Approach to TSP implementation

  • Review of performance characteristics along the recommended RTS corridors.

  • High level policy recommendations regarding TSP implementation

  • Recommended guidelines for implementing TSP on RTS corridors

    • To the extent possible at this stage of the RTS system planning

  • Recommendations for inter-agency partnership and coordination with regard to TSP operation and signal coordination.

  • Recommendations on technology and equipment

  • Prepare and deliver remaining deliverables.


Rts transit signal priority study deliverables

RTS Transit Signal Priority StudyDeliverables

  • Tech Memo 2: Existing conditions, Signal Systems & Operations on Corridors (Early – Mid September 2013)

    • Overall Transportation System Operations

      • Montgomery County and SHA signal characteristics (controller, signal head, TSP capabilities, etc.)

      • Transit Operational technologies & systems (MTA , WMATA, RIDEON, etc.)

    • Within each corridor:

      • Characteristics (length, number of signals, HCM LOS, volumes, signal coordination, etc. )

      • Existing and proposed ROW and other priority treatments

      • Existing and proposed transit service

      • Potential for TSP


Rts transit signal priority study deliverables1

RTS Transit Signal Priority StudyDeliverables

  • Tech Memo 3: RTS Transit Signal Priority Planning Technical Memorandum (Mid – Late September 2013)Document Findings and Recommendations on:

    • Existing conditions and assumptions

    • TSP Policy and Corridors

      • Recommended Montgomery County RTS-related TSP policies and procedures

      • Preferred minimum criteria and Measures of Effectiveness (MOE) for selection and evaluation of TSP locations

      • Preliminary operational review of RTS study corridors

    • TSP and Traffic Operations

      • Preferred active priority strategies

      • Preferred detection system parameters

      • Preferred traffic control system parameters, including coordination and recovery process

    • Concept of Operations and System Control

      • Integration of TSP with other transit ITS, traffic engineering, and EMS pre-emption systems

      • High-level Concept of Operations for TSP integration with the RTS system

      • Recommended system control architecture


Back up slides

Back Up Slides


Transit signal prioritization tsp and rts rts transit signal priority work group

Traffic Signals 101

1 Cycle

  • A Cycle consists of multiple Phases

  • Phases allocate time to movements competing for shared right-of-way

  • Phase Length is a function of geometry, and vehicle and pedestrian volumes (demand)

Phase

Phase

Phase

Cycle length is sensitive to many factors including coordination with adjacent signals; time of day; volume demand, and vehicle detection (e.g. loops)


Transit signal prioritization tsp and rts rts transit signal priority work group

Benefits of TSP

Improve travel time reliability and schedule, reduce delay and reduce emissions, may increase ridership

Waiting at Traffic Signals represents an average of 15% of a bus’s trip time1.

Cause of signal delay include:

  • Pedestrians Crossing

  • Volume-related delay

  • Accommodating side-street traffic

  • Special phases (e.g. left-turns only).

  • Conditional Priority reduces severe delay and improves reliability

  • 1. (“Overview of Transit Signal Priority.” ITS America, 2004)


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