OK guys, I see you're all treating the idea as a training simulator! Well, this is far more than that!
Looks like you'll be all bored with a driving game where you have to follow the rules & everything, but you follow the rules on FS & TS and that's why these games were made for in the first place AND that's why they called them "Simulators"! I guess this whole problem can be solved EASILY by putting a "Race Mode" as a secondary option! So when u get really bored you can take a Moster Truck and crash all the vehicles on ur way, or take a cute little Diablo to 'cut' your way through traffic!

And as I said; the idea of driving for fun might seem boring to u, but think of it a bit wider: Like putting some challenges (driving through a mountaneous road covered with snow!), or just driving on a straight road in the middle of the desert enjoying the sunset!
Take the game "Road Trip 2000" as a nice example for this project! It has roads up to 100 Miles long!
And by the way I liked the idea of Cvrt7.62Ghst! Implementing all these games together sounds real interesting and real HUGE (10 CDs at least! + 10 Gb HD space!) ;) It's difficult but doable!