Transit Signal Priority: Evolution Arnab Gupta, PE AECOM ARIZONA’s ANNUAL TRANSIT CONFERENCE 2016

Agenda Introduction Overview of Priority Traffic Signal Control Strategies Bus Signal Priority Predictive Priority Multi-Modal Intelligent Traffic Signal Systems (MMITSS)

The Problem Increasing urban congestion leads to: Delay for transit vehicles Higher operating costs Increased trip times

Transit Signal Priority TRAFFIC Simple Signal Control Bus Signal Priority Predictive Priority MMITS: Connected Vehicle Signal Pre-emption TRANSIT

Operating Strategy Provide for safe interface between LRT/ BRT and vehicular traffic by separating conflicting movements at street crossings Minimize delay to LRT/BRT vehicles through intersections.

BUS PRIORITY

Bus Signal Priority Transit phase(s) are extended. Transit Operating with Priority Control of Traffic Signals Early Green Green Extension Transit phase(s) are extended. Non-transit phases are shortened.

GPS Based System

Transit Split Extension Local Zero Phase 2/6 Phase 1/5 (1) Transit Extension (2) Phase 4/8 Phase 3/7

Bus Priority Other Options: Dedicated Transit Lane Queue Jump Lane

PREDICTIVE PRIORITY

Predictive Priority Provides multiple opportunity for transit vehicle to be served during any phase. Advanced vehicle detection FEATURES: Peer-to-peer communication. Early Green with Phase swapping Green Extension Phase Insertion

T1 T2 T3 T4 CONTROLLER BUS DETECTOR Splits Adjusted based on advanced detection. This is used for selection of Priority Levels.

Predictive Priority Operations LRT Phase LRT Phase Phase 2 & 6 (CONCURRENT TRANSIT PHASE) Phase 3 & 7 Phase 4 & 8 Phase 1 & 5

Operations Planning Using Simulation Software-In-the Loop simulation with VISSIM. Replicates exact controller operation during simulation and speeds up the implementation/systems integration phase.

TSP : CONNECTED VEHICLE

MMITSS Two way communication between bus and infrastructure. Priority request generated/granted on multiple factors. Transit Operator provided confirmation of the grant of TSP request Improves safety

Connected Vehicle

Source: “Multi-Modal Intelligent Traffic Signal Systems Impacts Assessment”, FHWA JPO-15-238, Aug 19th, 2015

Questions?? Thank You!!