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The Ingolstadt-based car manufacturer Audi is bringing the Vehicle-to-Infrastructure (V2I) service "Traffic Light Information" to Germany. Starting in July, Audi plans to connect its new models with the traffic lights in its hometown of Ingolstadt, with other European cities to follow from 2020. The idea behind the service: cars should ideally drive through the city on the "green wave." Audi aims to make urban driving more relaxed and efficient.
The "Green Light Optimized Speed Advisory" (GLOSA) displays to Audi drivers on the dashboard the speed at which they would reach the next green traffic light. If this is not possible within the current speed limit or if the driver reaches the next light while it is red, a countdown—the "Time-to-Green" service—counts the seconds until the next green phase in the Audi virtual cockpit or head-up display. In the U.S., GLOSA has been available in North America since February, while the Time-to-Green service has been in use since the end of 2016 and is now available at over 5,000 intersections, according to Audi, including cities like Denver, Houston, Las Vegas, Los Angeles, Portland, and Washington D.C. In the U.S. capital alone, around 1,000 intersections are reportedly connected with traffic light information, meaning Audi already has experience in this area. The company is the first manufacturer worldwide to connect its production models with city traffic lights.
"Stop-and-go traffic in the city is annoying. We welcome green waves, but unfortunately, we catch them far too seldom. With the Traffic Light Information service, the driver is more sovereign on the road, driving more relaxed and efficiently because, even hundreds of meters before the light, they know whether they'll reach it on green," says Andre Hainzlmaier, Head of Development Apps, Connected Services, and Smart City at Audi. "In the future, the anonymized data from our cars can help better coordinate traffic lights in cities and optimize traffic flow," Hainzlmaier continues.
Both "Time-to-Green" and GLOSA are set to be activated at launch in Ingolstadt in selected Audi models, including all Audi e-tron, A4, A6, A7, A8, Q3, Q7, and Q8 models produced from mid-July onwards ("model year 2020"). This requires the "Audi connect Navigation & Infotainment" package as well as the optional "camera-based traffic sign recognition." Audi is committed to offering traffic light information in additional cities in Germany, Europe, Canada, and the USA in the coming years. In the eastern Chinese mega-city of Wuxi, Audi and partners are testing the networking between cars and traffic light systems as part of a development project.
Traffic benefits from a digital infrastructure
In the future, other functions could benefit from the service, for example if green waves are incorporated into optimal route guidance, Audi outlines. It is also conceivable that the e-tron models could use more braking energy to charge the battery when rolling up to a red light. Coupled with predictive adaptive cruise control (pACC), the cars could even brake automatically before a red light, which would be an interesting support for autonomous driving.
In the long term, all traffic in cities is expected to benefit. The car manufacturer takes a look into the future: If cars were to send anonymized data to the city, traffic signals could switch more flexibly. For example, if there were no other cars in sight at a red light in the evening, connected traffic lights would then react accordingly.
Translated automatically from German.“The city is one of the most complex environments for an autonomous car. Nevertheless, the vehicle must always be able to find its way, even in rain or snow. Here, data exchange with the traffic infrastructure can be highly relevant,” says Hainzlmaier.
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