Parking Sensors and killer curbs

[_Eeyore]

Anyone out there with parking sensors? I'm seriously considering getting them installed but I'm worried about those nasty concrete and asphalt curbs that seem to be everywhere around here. Do parking sensors actually pick up those things before you crunch your bumper? I'm talking about the low ones that are just begging to scrape your car.

 

[Rolly]

I mean they're helpful but the side mirrors are still your main guide.