[yetanother12345]

> frowned upon to mindlessly browse when you're driving a car.

Here, illegal. Traffic safety. Same goes for cellphone usage. Even on bikes.

But then perhaps OP was thinking bus, train, etc... but there you often have other problems like you mentioned, available space being the most important one. Smartphones seem to have solved that problem judging by the behaviour of my fellow commuters.

They seem to manage staring at a screen no matter how impossible the setting is and even regardless of the potential dangers of them being totally unaware of what is going on around them. Impressive, really.