the reason the mirrors flip up is so the mirrors don't hit anything else that's there...the sensors pick up objects around the body but since the mirrors portrude (spelling?) out of the body it's better to fold them than risk hitting something.

By the way...the lexus system isn't bad either. I would say that the lexus is helping idiots dig themself out of a "kind of" hard situation while this system is so freakin straight forward that whoever needs this system should just stop driving cars. I mean if you can't pull up STRAIGHT into a spot, then you have no reason to drive...take the damn bus.