U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| FACT SHEET |
| This fact sheet is an archived publication and may contain dated technical, contact, and link information |
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| Publication Number: FHWA-HRT-15-011 Date: November 2014 |
Publication Number: FHWA-HRT-15-011 Date: November 2014 |
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The Eco-Approach and Departure at Signalized Intersections application uses wireless communications to give drivers recommendations that encourage “green” approaches to signalized intersections. The purpose of the application is to increase the fuel economy and reduce the emissions of vehicles traveling through an intersection.
Signal phase and timing (SPaT) data are broadcast from a roadside unit located at a traffic signal controller to a connected vehicle using wireless communications. The application located in the vehicle uses the data to determine the best speed to reach the next traffic signal on a green light or to come to a stop in the most eco-friendly manner. The application also considers a vehicle’s acceleration as it departs from a signalized intersection, as well as engine start-stop technologies.
