It is unlawful to curse while driving a vehicle.

The Law Explained

Road rage is taken to a whole new level of illegality in Delaware's largest city, where using profane language while operating a car is technically a misdemeanor. This ordinance was meant to uphold public civility and prevent disturbing the peace on busy metropolitan streets. While nearly impossible to enforce today, rolling down your window to drop an F-bomb is still a regulatory no-no.