[VHFcontesting] Who's driving that rover?

[k4gun at comcast.net]

I know... I'm asking a lot of questions for a guy who just signed up on this list.  I'm new and this seems like the place with the most infored opinions about what I'm trying to learn.

My latest question has to do with driving.  Here is the text of the rules from the ARRL:

2.3. Rover: A rover is comprised of no more than two operators that moves among two or more grid squares during the course of a contest. An operator may perform any or all rover functions, but a driver's function shall be limited to driving the vehicle. Drivers may be switched out during the event. Any number of observers is also allowed, however observers may not perform any rover function at any time. Rover vehicles with only one occupant are allowed to perform all functions listed above. 

Explain to me, what that means.  If I have another person in the vehicle and the vehicle is in motion, is the driver not allowed to do anything other than drive the vehicle?  That seems a bit silly to me, especially when it looks like a person driving alone is allowed to not only tune and talk, but also to log.  A person with a navigator could quite easily operate a radio on one band without much danger if he didn't have to also log the contacts.  

Does this literally mean that if I plan on operating while moving, I either have to leave all duties to the person in the passenger seat or leave the passenger at home and assume all duties, including logging?  Does anybody actually do this?  I'm just curious and want to start out doing this the right way.

Steve
K4GUN