[Youcandothis]

I don't think noise is necessary. It's only that people are used to noise. I usually wear sound isolating earphones outdors, so I don't hear cars as much now. But to compensate for that I look more around. That's something everyone could learn. Exception is those that are blind, but I think they should be able to get some help from technology to warn them from cars.

[OscarCunningham]

I think my preferred policy would be to mandate this noise for now and then slowly quieten it as people got used to quieter cars.