In Rockville, Md., you will be slapped with a misdemeanor if caught swearing while on a highway. Luckily, you'll only be fined if your profane language is uttered "within the hearing of persons passing by." If a driver curses in Rockville and no one is there to hear him, does he make a sound?
In New Jersey, drivers are required to beep their car horns before passing another vehicle. Technically, the law requires "audible warning" with a "warning device," so feel free to ditch your horn and get creative.