Delete Road Geometry

Setup Vehicle Environment Delete Road Geometry
Deletes the graphics associated with the road. This can be useful when you are using 'fit' commands and the default model becomes very small in relation to the road graphic. Deleting road geometry does not affect the results of the full-vehicle Analysis or your ability to animate the results.
 
Tip:  
If you right-click in the main window, away from any modeling elements, and select Fit - no ground, Adams Car resizes the window, allowing you to see the enlarged default model without worrying about the size of the road graphic.
 
For the option:
Do the following:
Full-Vehicle Assembly
Select the assembly whose road geometry you want to delete. The menu lists all open assemblies.