When we went to Newfoundland in 2006 all we listened to was "The Best Of Creedence Clearwater Revival".

I could see how Creedence would be good driving music though - they have a kinda free flowing sound that would take well to high speed travel...

"Fortunate Son" was made for highway driving.

I've found that playing "Detroit Rock City" is not conducive to driving at the speed limit.

"Cotton Fields", "Bootleg", and "Walk On The Water" were favorites of mine.

Van Morrison

tom petty
the eagles

those are my 2 favorite while traveling

Petty is fantastic for traveling. Although if your in the city the music is ruined. Best for the those long country roads.

REM - Drive!!!

Actually I found all of Automatic for the People very soothing when I was driving through city traffic alot - it has a way of pervading the senses and mellowing me out enough to stave off even the worst of road rages... it also happens to be one of my favorite albums of all time!