I have a 2015 S with air suspension and the front end detectors absolutely don't report low curbs ( 5" or less?)/wheel stops and the the front end will clear them. However, on reentering the car the front end is now resting on them (see extensive threads on this mysterious "settling" with air suspension), and I'll hear a scrape on backing out (but it's just black plastic, right? No big deal?) We'll, yesterday my entire front bumper popped out when I went into reverse. Yes, I cried. So if you're hearing that scrape routine in certain lots: always raise the suspension before backing out, or always back in, so you can see what you're doing. I know people will suggest I just don't overhang a curb, but I can't see the dang curb.