I want to contribute this as it might be helpful for some people. The code is commented and easy to understand. Includes:

-A PhysX car with proper parameters so it has a more realistic behavior. It has a 6-gear manual gearbox with speedometer and rpm-meter.
-AI traffic cars that follow path, reacts to stops signals, speed limit signals, traffic lights and other cars.

-Traffic signals models made by me, you can use them if you want
-Road models by Reiner “Tiles” Prokein

Move with arrow keys, toggle camera with c and shift gears with a and z



Download link: http://www.mediafire.com/?vts4cqlgjribi67

I think it needs to be polished a bit, because the ai doesn´t react to me nor to the stop signs. My speedometer made 3 rounds and you can make music if you drive with 180 and change from 6 to 1 and back

But all in all it´s fun

Thanks

BTW it´s really hard to steer the car

It plays quite nice, the ai seems to stop at the stop signs, and I think the driving of the car isn't that hard.
however, I get a trackmania feeling: I can move trough the ai car like if it were a ghost.

yes, that's because if they are rigid physics entities the player's car could get stuck into them

thx for share