How to use collision between meshes?

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Hi,
I am trying to creat a mesh which acts as a street and then another mesh, a car, can travel on it.
Now if my road is on an incline or decline, my car still remians on the same place, so going under or over the street.
I am trying to use to make sure it slides over the street but it doesn't seem to work.
Any ideas? Thanks in advance.