Home / Nova Scotia / Questions / Rules of the Road Rules of the Road Report A vehicle horn should be used to: A Express frustration B Warn of a danger or potential collision C Greet friends D Whenever Show Answer & Explanation Correct Answer: B. Warn of a danger or potential collision Loud vehicles can also be ticketed separately. Previous Next More Rules of the Road Questions The core principle of defensive driving in NS: Flagger reverses paddle to 'SLOW': Flagger holds red 'STOP' paddle in work zone: School crossing guard with STOP paddle in road: Construction zone with workers present: Often Missed All Nova Scotia Questions Smart Practice Mock Exam Road Signs Guide