I love my Bel 940. It works amazing! One obvious thing it doesn't work for, which I was rudely reminded of, is AIRPLANE COPS!
Driving through Missouri, a group of us "10 over clubbers" were all huddled in a pack, when a bunch of patrol cars fly down an entrance ramp and pull us all over! I was told that there was an airplane in the area clocking speeds, resulting in a 12 over PSL ticket for yours truly. The worst part is that I set the cruise at 80, preventing the temptation to put the lead on the pedal, and I still got nabbed!
Anybody else have this unfortunate event happen to them? :x