[ODE] Simples Car Possible (for traffic)

[kurimail]

Hi friends. I would like to know what is the fastest and easiest way to
make a car in ode, with fake physics if needed, to simulate traffic.

I have my own cars for players running very well with 4 hinge2joints, but
i want to add some traffic. If i use hinge2joints for 20 traffic cars,
things slow down a lot...

Is there any sample of very very basic car setup?

Thanks in advance!