Comment by thunky
It would only beep inside the car. So if other people are driving and it's beeping then they should drive better so they don't annoy their passengers (you).
The point of the beep is to get the driver's attention so they slow down. Similar to rumble strips on the side of the highway.
Ah, I see. "Beep" is a alt term for using the horn where I am from. I was imagining constant honking from hundreds of cars. An internal warning makes much more sense.