You are correct, it is designed to catch moving traffic, but it would also catch someone going underneath in a stationary traffic jam. Actually studies have sh

You are correct, it is designed to catch moving traffic, but it would also catch someone going underneath in a stationary traffic jam. Actually studies have shown that people on (hands free) phone calls are also very distracted from the task of driving, driving slower than the traffic, around corners etc. [Haque et el at QUT. A small study in a simulator, but it certainly matches anecdotal observation... https://www.sciencedirect.com/science/article/abs/pii/S0001457518301246?via%3Dihub https://www.sciencedirect.com/science/article/abs/pii/S00014... ] Just tuning the radio or even listening to the radio can increase response times. Unsurprisingly, having children in the car can also significantly increase risk. [MUARC] Remember that next time you see a Baby On Board sign.