Avas

The coming Audi E-tron GT, for example, has control units that remix the sound effects based on the car’s speed or the position of the accelerator pedal. Also fitted to the Audi is an AVAS — an acoustic vehicle alerting system, required to alert pedestrians that an electric car is close by.

Tony Bowen, of Brigade Electronics, a firm that spent three years developing a “quiet vehicle sounder”, said permissible frequencies and modulation under the regulation make it clear that the Avas should mimic an internal combustion engine.