For me, it comes down to this: if I really want to enjoy a piece of music (i.e. close my eyes), or if I really want to commit to a conversation with another passenger, I can do that on a train. In a car, I and/or others will be dead.
The same goes for audiobooks: it may be possible to listen to shallow fiction in a car, but anything that requires true attention and concentration is very hard to follow while driving without putting yourself in danger, at least in an urban environment or at high speeds.
The same goes for audiobooks: it may be possible to listen to shallow fiction in a car, but anything that requires true attention and concentration is very hard to follow while driving without putting yourself in danger, at least in an urban environment or at high speeds.