A time far far ago, we had vehicles with big windows and we can see everything around us. In this time the cars were all about driving. Today the cars have such small windows that you can’t see a lot. These small things called windows are the reason for using parking sensor or rear-cameras. But that isn’t the point.
The point is all about the driver: as much as you have and use electronic stuff in your car as much you loose the feeling how big your car is.
So try to know how far away the car behind you is. And the get out and have a look.
And in the picture you can see what happens when you think you know how big your car is and it is actually bigger… 😉