Electric cars do not have an internal combustion engine - which is great for the environment. However, this means that they are amazingly silent. This brings up some unique safety issues. People can't hear the cars coming up behind them.
To find a solution to this problem, a research project in the University of Warwick is using a green van called ELVIN (Electric Vehicle with Interactive Noise) which emits different sounds to see how people perceive the sounds.
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