Depends on where the highway is. If it's rural and away from big cities, it can be relaxing. If you're trying to drive to / through Toronto, it's a fucking nightmare. People will drive up your ass and cut you off then brake immediately, not let you into your exit lane which starts and ends with little notice, and the signage leading up to it was blocked by bumper to bumper traffic and big trucks. Yes, I am bitter about it.
To me it has a similar feel to some of the later Sonic games, but without the fear of falling off the level. I recommend checking out a how to play guide because it just jumps in without explaining.
That's its "serious movie poster" face