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What sort of road building / improving did you have in mind?

We’re talking about city centre slow (<12mph) driving, I’m really not sure what road improvements could improve safety of silent cars?

Probably a lot can be done to help safety without adding noise. Maybe something as simple as warning signs for silent cars can help.

My bad. I completely missed the point and thought they would make them noisy in general.

I wonder how they will solve the noise problem if it’s just slow moving traffic.