The feature is available on Audi A4, A4 Allroad, and Q7 models built after June 1, 2016, and requires a subscription to Audi's streaming service. Audi points out that setting up a V2I infrastructure opens up the possibility to provide navigation directions that take traffic lights into account. Cars could even coach drivers how fast to go to hit more green lights.
In addition, this information could allow engine start-stop systems to shut off sooner when approaching red lights and start up immediately when the light turns green. Information could also flow back to municipalities, giving them a more accurate picture of traffic flow. Washington will soon join Las Vegas in supporting Audi's V2I technology. They're the only two cities confirmed so far, though Audi says it's working to get more on board.