If you have the site plans as a jpeg, you want to use the WME Image Overlays script, which allows you to overlay an image over the editing map, adjust it for scale and angle, and then draw roads using it as a template.
If you have the site plans as a jpeg, you want to use the WME Image Overlays script, which allows you to overlay an image over the editing map, adjust it for scale and angle, and then draw roads using it as a template.