Victoria : Règlement no 09-079, art. 96(2) — Streets and Traffic Bylaw

The driver, operator, or other person in charge of a vehicle equipped with a horn that is not an air horn must not sound or permit it to be sounded in the City

except

• (a) as required under the Motor Vehicle Act, or
• (b) for the purpose of giving reasonable warning to persons using or about to use a street, of a hazard or danger arising out of the presence or approach of the vehicle.