The Dune Buggy has no license plates, which would make it illegal to drive on the road. While it could be argued it is not supposed to be road-legal vehicle, NPCs are routinely seen driving it around Blaine County. Other vehicles that lack plates include the Sanchez, the PCJ-600 (once modified), the Ruffian (once modified) and the Zentorno (XBOX 360/PS3).
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F adds a deaf dada