https://en.wikipedia.org/wiki/Truck_nuts> In 2011, a 65-year-old South Carolina woman was ticketed by the town's police chief for obscenity displaying truck nuts on her pickup.[7][8][9][10] The case, originating in Bonneau, S.C. (population approximately 480), was pending jury trial on her $445 traffic ticket. The case was continued three times and no new trial date was set.[11] According to the Above the Law legal analysis blog, the ban was discussed in the ABA Journal and presented constitutional freedom of speech questions.[12] The stated position of the Honolulu Police Department in 2013 from their city corporation counsel's office concerning obscene bumper stickers is, "It may be tasteless but it's protected as free speech."[13]
Truck Nuts are free speech