How to check if a 3D object on an irregular path?

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:bust_in_silhouette: Asked By 1izNoob

So I have made a road with a CSG object and a path. Now I want to check if a car (a 3D object) has contact with that road. But I cannot seem to figure out how to? A collisionShape only has primitive shapes and collisionPolygon does not seem to let me create a more complex shape.

Is there a solution for that?