TEST AREA 54 is a place where you can test out you cars and trucks in all kinds of ways, including:
Dirt Track Racing
In the video under you can see some of the places you can try out in this map:
Just put the Offroading.zip in your Mods, or Mods/Levels folder.
Beta TEST AREA 54 1.0.2
Automotive testing the old fashioned way.