@dmoren I had the same thought, but I **think** it's based on location services not any sort of comms with the car.
But apparently it needs enhanced support on the car side regardless, so you and I are SOL anyway :(
They’ve been using accelerometer to lock out iPhone functions for years now.
In my case, it is the iPHONE governing safety concerns and app disabling - the phone damn well knows you are moving.
Maybe you could park on a hill start a movie put the car in neutral and let it start rolling down the hill and see what happens.
It’s CarPlay, not AirPlay.