Mine suck here in Halifax Municipality. On a Ninja 250, about 95% of them failed to detect the bike. On an SV650 it is 75% of them. We have the long rectangular ones that fit two cars, and some half-size. Each loop either works 100% of the time, or does not work 100% of the time for me. So I would never find that the same one detected me one day, and then the next it worked fine. It would be interesting to know if this is a normal failure rate.