Home / Nova Scotia / Questions / Rules of the Road Rules of the Road Report A vehicle horn is to be used for: A Expressing frustration at other drivers B Warning of a danger or preventing collision C Greeting friends D Signalling that a light turned green Show Answer & Explanation Correct Answer: B. Warning of a danger or preventing collision Professional habit to use sparingly. Previous Next More Rules of the Road Questions The core principle of defensive driving in NS: A conviction typically affects your NS insurance for: Photo radar or red-light cameras in NS: Studded tires on bicycles in NS winter: A roadside memorial (flowers, cross) on NS highways: Often Missed All Nova Scotia Questions Smart Practice Mock Exam Road Signs Guide