Or in other words.
You want a solid racetrack. Asphalt only.
It looks like you already drew a poly outline of the track.
If we take a straight this may look like this + = vertice: - = line
----+----+----+----+----+----
----+----+----+----+----+----
Now always select 4 vertices.
----+----+----+----+----+----
----+----+----+----+----+----
Starting from one corner selecting them counter-clockwise.
Then press ctrl+shift+s to create a surface between them.
Do this for all vertices.
If you now extrude all surfaces one time by some millimeters you have a solid block-racetrack.
Be shure to select the option namend something like "close edges/sides" when extruding.
Hope that helps.
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