Ingolstadt, Germany – Audi’s has expanded its experimental Travolution project to enable vehicles to communicate directly with traffic light systems, using wireless LAN and UMTS links. 15 test vehicles and 25 sets of traffic lights now permit the system to be sampled in actual traffic conditions in the city on the Danube.

The traffic signals transmit data that are processed into graphic form and shown on the car’s driver information display screen. The graphics tell the driver for instance what speed to adopt so that the next traffic light changes to green before the car reaches it. This speed, which keeps the traffic flowing as smoothly as possible, can then be selected at the adaptive cruise control (ACC) – but the driver can also delegate this task to the car’s control system.

The results obtained during the first travolution project in 2006 were immediate and dramatic: reduced waiting times at traffic signals cut fuel consumption by 17 percent. In a full year this would save as much as 700,000 litres (184,920.44 US gallons) of fuel.

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