I have been in friends cars in Japan, as well as airport limos, and not only do they have DVD players that work as you drive along, they also get TV stations too!
We went from Narita intrnational to Saitama precture a couple years ago in a Toyota 8 seater limo/Hiace and the whole way, the TV was on the centre front screen, the driver was doing 150km/hr on the expressway at the time..... in 80km/hr zone. No one seemed bothered, othr cars doing similar speeds.
Our Japanese friends from Nagoya have a Toyota Vellfire people mover, its the same.
I must ask our other Japanese friends who have a 2017 CX5 if theirs can play DVD*s while driving, and TV too.