Car falls through race track

Unity Engine
1

I might just be having a blond moment
I have a race track that I have created and every time I click play the car just fall straight through it.
I cant work out how to keep the car on the track.

I have a Rigidbody on the car I also tried it on a normal plane and the car stays on it

2

Turn off convex on the the mesh collider of the track. Having this on replaces the track’s original collider with a regenerated one that encloses the entire track, thus making the car start inside of the new track’s collider. Also make sure your car has a collider.