Kauai Regional ITS Architecture

Project Details: Kauai Bus Transit Signal Priority (TSP)


PROJECT OVERVIEW

Project Name:

Project Details: Kauai Bus Transit Signal Priority (TSP)

Description:

This project will implement transit signal priority to improve schedule adherence.

Status:

Planned

Timeframe:

Long-Term

Geographic Scope:

Kauai

Project ID:

K-25

Stakeholders:

Hawaii Department of Transportation, Highways Division, Kauai District
Kauai County Transportation Agency

Service Packages:

Project Inventory:

HDOT-HWY-K Field Devices
HDOT-HWY-K Traffic Control Center
Kauai Bus Fixed Route Dispatch
Kauai Bus Fixed Route Vehicles

FUNCTIONAL REQUIREMENTS

Click on a Project Inventory element from the list above to view functional requirements.

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 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
HDOT-HWY-K Field Devices right-of-way request notification HDOT-HWY-K Traffic Control Center
HDOT-HWY-K Field Devices signal control status HDOT-HWY-K Traffic Control Center
HDOT-HWY-K Field Devices signal fault data HDOT-HWY-K Traffic Control Center
HDOT-HWY-K Traffic Control Center signal control commands HDOT-HWY-K Field Devices
HDOT-HWY-K Traffic Control Center request transit information Kauai Bus Fixed Route Dispatch
Kauai Bus Fixed Route Dispatch traffic control priority request HDOT-HWY-K Traffic Control Center
Kauai Bus Fixed Route Dispatch transit system data HDOT-HWY-K Traffic Control Center
Kauai Bus Fixed Route Vehicles local signal priority request HDOT-HWY-K Field Devices
Kauai Bus Fixed Route Vehicles transit vehicle schedule performance Kauai Bus Fixed Route Dispatch

ITS STANDARDS

SDODocument IDTitleType
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
Hawaii Department of Transportation, Highways Division, Kauai District
Provide signal priority when requested for Kauai County Transit vehicles
Kauai County Transportation Agency
Coordinate with HDOT-HWY-K for traffic signal priority.
Track and evaluate schedule performance for all Kauai Bus vehicles.
 

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