LG VX-4700 / VX-4650 / AX-4750 / UX-4750

It appears that the documentation for the VX-4650 says nothing about Driving Mode apart from the fact that it exists. So what exactly happens in driving mode? I've figured out that if I flip the cover it automatically goes to voice commands, and that's cool. But what happens with incoming calls? Anything else worth knowing about Driving Mode?

Thanks!
Ron Moses