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Audi Spreads its Traffic Light Information Service

Audi continues networking traffic lights. Düsseldorf has become the 2nd city in Europe after Ingolstadt where the carmaker introduces its Traffic Light Information service.

This vehicle-to-infrastructure (V2I) service helps drivers know in advance when traffic lights will switch to green. The service adds convenience, safety and fuel economy during road trips.

Audi is the first automaker in the world to network series-production models with city traffic lights.

From this month, drivers of Audi vehicles will see information from around 150 traffic lights in their cockpit to catch a “green wave”. By early summer 2020, 450 out of 600 intersections in Düsseldorf will be networked.

Audi Traffic Light Information operates in all Audi e-tron, A4, A6, A7, A8, Q3, Q7 and Q8 models produced since mid-July 2019. The pre-requisites are the Audi connect Navigation & Infotainment package and the optional camera-based traffic-sign recognition.

The service debuted in 2016 in Las Vegas. Today it is available at more than 10,000 intersections in North America including New York City and Washington D.C.

In future cities will receive useful info about their traffic light infrastructure.

Audi Traffic Light Information consists of two functions: Green Light Optimized Speed Advisory (GLOSA) and Time-to-Green.

GLOSA calculates the speed which is ideal for a “green wave”. For example, if the function indicates the applicable speed limit, the next traffic light will be reached at green.

To optimize stop-and-go traffic, GLOSA suggests reducing speed gradually about 250 m ahead of the traffic lights for the driver and the vehicles behind reach the intersection when the lights turn to green.

If stopping at a red light is unavoidable, a countdown displays the seconds remaining until the next green phase starts (Time-to-Green).

Several studies show that drivers move through cities more efficiently thanks to networked traffic lights. Audi reduced fuel consumption by 15% in a pilot project.

Source: Audi

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