My daugther had a hire car while hers was repaired last year and they phoned up the day after it was returned and said there was a huge crack in the windscreen and it was upto her to cover the cost.
Some woman kept phoning her, bullying her into making card payment over the phone threatening legal action etc..........
I told Emma, next time she phoned, that could she please provide her with the paperwork to show the vehicle condition before and after her period of hire with her signature on it..............
Didn't hear from them again!
To the OP.......... reverse sensors go to CONTINUOUS beep even when you're still about 10-12 inches away
When you're in an unfamiliar car - you wouldn't drive past the fast beep, just before it goes to continuous..........
E92 M3 - Interlagos Blue and Black everything else!!!