When I posted my wheel collider demo on the Unity forum I got some good feedback. This post includes an updated scene and script.
Unity Wheel Collider: Conclusion
The finished Unity Wheel Collider scene in the Unity web player.
Unity Wheel Collider: Part 3
The wheels are fixed so they appear to spin and steer, reverse gear is added and the complete updated script provided with commentary.
Unity Wheel Collider: Part 2
A simple vehicle control script is explained and added to our wheel collider project.
Unity Scripting: the Artist’s Perspective
I explain how easy Unity scripting is for non-programmers.