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Signal Phase and Timing and Related Messages for Connected Vehicle Applications

Project Information

Project ID: 
Project Status: 
Start Date: 
Thursday, July 26, 2018
End Date: 
Thursday, July 26, 2018
FHWA Program: 
FHWA Subprogram: 
Transportation Systems Management and Operations
FHWA Activity: 
Transportation Management
FHWA Topics: 
Road Operations and Congestion--Transportation Management
TRT Terms: 
Traffic Signals; Operations; Research; Safety; Highway Traffic Control; Traffic Signal Controllers
FHWA Discipline: 
Operations, Safety
TRB Subject Area: 
Operations and Traffic Management, Safety and Human Factors

Contact Information

First Name: 
Last Name: 
(202) 493-3267
Email Address: 
Transportation Operations Applications Team
Office of Operations Research and Development
Office Code: 

Project Details

Project Description: 

This project is to identify the necessary interfaces for two-way communication of traffic signal information between the traffic signal controller and a mobile device, provide the concept of operations for the use of the interfaces, and develop prototypes of the interfaces using signal controllers from two different manufacturers. The interfaces and prototypes shall be for use by the connected vehicle applications that require signal phase and timing (SPaT) and its related messages.


The key project objectives are listed below:

(1) Develop a two-way interface specification between two signal controller brands and Roadside Equipment (RSE) that will send signal phase and timing data from the traffic signal controller to mobile devices and receive Basic Safety Messages and Requests for Service from mobile devices using the National Transportation Control Interface Protocol (NTCIP) 1202 and the Society of Automotive Engineers (SAE) J2735 standards. 

(2) Test this interface at Turner-Fairbank Highway Research Center in the Transportation Operations Laboratory: Connected Vehicle Highway Testbed.

(3) Procure, configure, and deploy 50 signal phase and timing (SPaT) interface devices at Safety Pilot and other affiliated testbeds.  


Deliverable Name: 
Configure and deploy one model (Econolite) of an intelligent traffic signal controller and signal phase and timing (SPaT) interface devices at six intersections on Fuller Road as part of Safety Pilot.
Deliverable Type: 
Deliverable Description: 
Procure, configure, and provide technical (onsite and offsite) support to successfully deploy signal phase and timing (SPaT) interface devices at six intersections at the Safety Pilot Model Deployment in Ann Arbor, Michigan. This also includes the latest version 3 of 5.9 GHz Dedicated Short Range Communications equipment.