Well in the UK we have SCBS where a laser detects if you're going to bump the car in front of you for speeds up to about 20mph. To stop bumps at traffic lights etc. Well nobody is actually risk checking this are they! Anyway the other day when leaving work the barrier was on its way up to let me out of the car park (as I was still slowly moving forward). When it got about halfway up my car suddenly braked all on its own and brought me to a stop! I first though WTF! then noticed the warning on the dash saying SCBS had been activated. It had obviously detected the barrier going up! So Yes......It works!