Sweeping generalisation or otherwise, but my gf's spacial awareness in a car is awful. I bought and retrofitted a Parking Dynamics PD1 kit to the rear of her Golf and I think it has helped. The it was 90 quid odd if I remember, and consists of a metal strip that goes across the inside of the bumper, so you can't see it from the outside. Seems to work perfectly well. Only tricky part was taking the rear bumper off, but found a guide online. For those worried about aesthetics of a retrofit, it might be worth checking out.