Las Cruces Regional ITS Architecture Update

RoadRUNNER / City of Las Cruces Transit Signal Priority

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Description

Provide transit signal priority for fixed-route buses.

Status

Planned

Timeframe

Medium

Geographic Scope

Las Cruces

Service Scope

Transit Management, Traffic Management

Stakeholders

City of Las Cruces Transportation Department

RoadRUNNER Transit

Inventory

City of Las Cruces Traffic Management Center

City of Las Cruces Traffic Signals

RoadRUNNER Fixed Route Dispatch System

RoadRUNNER Fixed Route Transit Vehicles

Services

APTS09-1 - Transit Signal Priority - RoadRUNNER Fixed Route

Functional Areas

On-board Transit Signal Priority

• The transit vehicle shall determine the schedule deviation and estimated times of arrival (ETA) at transit stops.
• The transit vehicle shall send priority requests to traffic signal controllers at intersections, pedestrian crossings, and multimodal crossings on the roads (surface streets) and freeway (ramp controls) network that enable a transit vehicle schedule deviation to be corrected.
• The transit vehicle shall send the schedule deviation data and status of priority requests to the transit vehicle operator and provide the capability for the transit vehicle operator to control the priority system.
• The transit vehicle shall prevent a priority request from being sent when the transit vehicle cannot use the priority (e.g., when the transit vehicle makes a passenger stop on the approach to an intersection).

Roadway Signal Priority

• The field element shall respond to signal priority requests from transit vehicles.

TMC Multimodal Coordination

• The center shall respond to requests from transit management centers for signal priority at one or more intersections along a particular transit route.
• The center shall exchange information with transit management centers including details current transit routes, the level of service on each route, and the progress of individual vehicles along their routes.

TMC Signal Control

• The center shall manage (define, store and modify) control plans to coordinate signalized intersections, to be engaged at the direction of center personnel or according to a daily schedule.
• The center shall implement control plans to coordinate signalized intersections based on data from sensors.
• The center shall manage boundaries of the control sections used within the signal system.
• The center shall maintain traffic signal coordination including synchronizing clocks throughout the system.
• The center shall remotely control traffic signal controllers.

Transit Center Signal Priority

• The center shall analyze transit vehicle schedule performance to determine the need for priority along certain routes or at certain intersections.
• The center shall send requests for priority along routes or at intersections to traffic management.
• The center shall define business rules that govern use of transit vehicle signal priority, communicate these rules to the transit vehicle, and monitor transit vehicle requests for priority at signalized intersections.
• The center shall provide transit operations personnel with the capability to control and monitor transit signal priority operations.

Interfaces

Source	Architecture Flows	Destination
City of Las Cruces Traffic Management Center	signal control commands	City of Las Cruces Traffic Signals
City of Las Cruces Traffic Management Center	request transit information	RoadRUNNER Fixed Route Dispatch System
City of Las Cruces Traffic Management Center	traffic control priority status	RoadRUNNER Fixed Route Dispatch System
City of Las Cruces Traffic Signals	right-of-way request notification	City of Las Cruces Traffic Management Center
City of Las Cruces Traffic Signals	signal control status	City of Las Cruces Traffic Management Center
City of Las Cruces Traffic Signals	signal fault data	City of Las Cruces Traffic Management Center
RoadRUNNER Fixed Route Dispatch System	traffic control priority request	City of Las Cruces Traffic Management Center
RoadRUNNER Fixed Route Dispatch System	transit system data	City of Las Cruces Traffic Management Center
RoadRUNNER Fixed Route Transit Vehicles	local signal priority request	City of Las Cruces Traffic Signals
RoadRUNNER Fixed Route Transit Vehicles	transit vehicle location data	RoadRUNNER Fixed Route Dispatch System
RoadRUNNER Fixed Route Transit Vehicles	transit vehicle schedule performance	RoadRUNNER Fixed Route Dispatch System

Standards

SDO	Document ID	Title	Type
AASHTO/ITE/NEMA	View List	NTCIP Center-to-Center Standards Group	Group
AASHTO/ITE/NEMA	View List	NTCIP Center-to-Field Standards Group	Group
ASTM	View List	Dedicated Short Range Communication at 915 MHz Standards Group	Group
ASTM/IEEE/SAE	View List	Dedicated Short Range Communication at 5.9 GHz Standards Group	Group
AASHTO/ITE/NEMA	NTCIP 1201	Global Object Definitions	Message/Data
AASHTO/ITE/NEMA	NTCIP 1202	Object Definitions for Actuated Traffic Signal Controller (ASC) Units	Message/Data
AASHTO/ITE/NEMA	NTCIP 1210	Field Management Stations (FMS) - Part 1: Object Definitions for Signal System Masters	Message/Data
AASHTO/ITE/NEMA	NTCIP 1211	Object Definitions for Signal Control and Prioritization (SCP)	Message/Data
AASHTO/ITE/NEMA	NTCIP 1214	Object Definitions for Conflict Monitor Units (CMU)	Message/Data
APTA	APTA TCIP-S-001 3.0.4	Standard for Transit Communications Interface Profiles	Message/Data

Operational Concepts

Stakeholder	Roles and Responsibilities
City of Las Cruces Transportation Department
	Operate traffic signal systems on City owned streets, including traffic signals, sensor systems (CCTV), and right of way requests.
	Provide transit signal priority for RoadRunner transit vehicles.
RoadRUNNER Transit
	Track vehicle location and evaluate schedule performance on all agency transit vehicles.