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Four automakers, the European Commission and other collaborators have spent the last three years working together on a system that can warn other road users about an approaching electric vehicle.

The system, known eVADER, uses a windscreen-mounted camera to detect pedestrians, cyclists and other road users. If someone is detected, a warning sound is targeted at that person via a six-speaker setup.

eVADER’s warning noise sounds rather like a science fiction tractor beam, and is said to be up to five decibels quieter than a regular petrol or diesel engine.

“Our objective has been to find an optimum balance between ensuring the cars are detectable, whilst retaining the reduction in noise pollution, which is one of the great benefits that our EVs offer,” says David Quinn, Nissan’s project leader on the eVADER programme.

Electric vehicles, due to their nearly silent motors, are much quieter than comparable petrol and diesel vehicles, especially during acceleration and at low speeds.

For real-world trials, Nissan built a one-off Leaf EV fitted with the eVADER system. It was apparently “well received” by visually impaired attendees at a trial event held at the end of 2014.

http://www.caradvice.com.au/375539/nissan-renault-peugeot-citroen-collaborate-on-ev-warning-system-for-pedestrians/
 

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Having seen enough around by now, it's obvious that EVs make plenty of wind and tyre noise. So for people with normal sight and hearing it's not going to be a problem.
People who are hard of hearing, or are using earbuds with music possibly still won't know where the warning is coming from.
 
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