>>and passed very close in front of us.
How does she know?
Nonetheless there is a point, and I guess road crossing is it. I don't think emitting a constant noise is an answer, legislated or not.
I wonder if electric vehicles could emit a radio signal which would react with a receiver causing that receiver to emit a sound? Such a receiver could be carried in small form by blind people, but also larger examples could be installed at crossings, outside schools etc. etc.
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