Cars driving down the road.

Hi Guys,

I want to make a racing game with npc cars for mobile phones. the player should be able to switch lines ala templerun.

I don't know if animations are the best choice because of the increasing speed of the player and eventually random levels.

The first thing I tried was a vector3 array the car looks at and

 Rigidbody.velocity = transform.forward*speed;

But I got problems with the speed of the linechange and >30 rigidbodies are also a performance issue for mobile devices.

Any Ideas?