Maybe it could also prompt you to use the sensors built into your head as well?

Honestly, if we're having a watch scream at anyone, I'd rather it be the drivers who are (a) unaware of the law about pedestrian crossings, (b) looking at their phone while driving, (c) driving like an asshole, (d) driving drunk.

It can or at least will: a driverless car that always stop, never speeds and never cheats will force everyone behind them to adhere to the rules they follow.

As long as there is some bit of human factor in the play, I would say no.

In a "perfect" world where everything and everyone is connected, sure. But consider what kind of world that would be.

I was hoping you were going to say “for example, the car could avoid driving into the pedestrian”.

Maybe pedestrians need to step up to the plate more and step away from traffic better simply because they have more "skin in the game".

For modern technology to be the most useful it may be something that would be just as effective if the traffic still consisted of horses & buggys or Model T's.