how to create waypoints for a car to follow?

I took this from Unity's FPS tutorial. Even though it is for a FPS, it isn't too difficult to transfer the idea to your unique game. http://download.unity3d.com/support/old-resources/files/FPS_Tutorial_3.pdf First section is "Waypoints", you will have to download the FPS_Complete and look up the script to see it.

create a few empty gameobjects and label them waypoint1, waypoint2 etc. then make another empty gameobject and put a collider on it and check the trigger box, then put this script on the trigger

 var waypoint1 : Transform;
 var waypoint2 : Transform;
 var waypoint3 : Transform;
 //extend this if you want
 var waypoint = 1;
 
 function Start () {
 transform.Position = waypoint1.position;
 }
 
 function Update () {
 // extend this part too if you extended the top
 if(waypoint == 2){
 transform.Position = waypoint2.position;
 }
 if(waypoint == 3){
 transform.Position = waypoint3.position;
 }
 }
 
 //im assuming your car has a collider
 function OnTriggerEnter () {
 waypoint += 1;
 }

then put this on the AI car

 var trigger : Transform;
 //make sure you assign the objects to the script in the editor
 function Update () {
 transform.LookAt(trigger);
 }

note that this wont look very realistic because the car will turn instantly. you could try RotateTowards but i didnt use it because i have never been able to get it to work