I came across a map that shows the routes that you can drive an ATV through town. I could be wrong, but having a buggy or a jeep registered as OHV allows you to use these routes as well. My parents have told me that they see sandrails and side-by-side atv's using these routes frequently.
http://www.pricecityutah.com/Visitor Info/Maps/ATV Routes Through Town.pdf
http://www.pricecityutah.com/Visitor Info/Maps/ATV Routes Through Town.pdf