My sister had an insurance tracker fitted in her car, and it was awful - it kept sending her emails saying "we detected you going 70mph on a 20mph road, if this keeps happening we'll cancel your insurance altogether" - we'd contact them asking for proof, they would send us a GPS trace and of course she was driving on the motorway going legal 70mph going ABOVE a 20mph street but the system was dumb enough to just check "what's the speed limit at those exact coordinates" and issued automatic warning letter. It would also frequently show her negative driver scores for "smoothness" of driving every time she would go over a speedbump. Absolute travesty of a system.