In my limited experience of driving our A3 plug-in hybrid in car parks, the people who were surprised by us driving by would have been equally surprised by anything...always those paying absolutely no attention to their surroundings! I can see for the blind there are potential challenges, but EVs are not completely silent...tyre noise is generally audible. A broadcast noise would, I think become very annoying and actually be worse than listening to an engine. A noise broadcast to those with a receiver is an interesting solution I guess.
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