A lot of parking lots have curbs/barriers at the front of the spots that are about 6" high. The parking sensors don't report these, presumably because the beam is going over it. I'm not sure how that could be fixed, but it's a problem. I wish there were a front camera that could see the ground in front of the car. Perhaps when the car was far enough back to see the curbs it could remember where they were and as the car moved show on the display where they are relative to the current position of the car.