if you’re cutting your streets, one of the great techniques is coating with durhams water putty. after it dries, you can slightly bend the street and it will crack in a way that mimics real streets.
another material i’ve used is task board. usually comes in two thicknesses (i think 1/8” and 3/8”). can be cut easily, has a slight texture and easily painted. i often start with primer gray, adding lighter gray, a camo tan and a camo green as desired all with spray cans. then add chalks for tire marks and markers to draw cracks or very thin application of black paint to simulate tar.
