Road Rules 2014
Current version for 29 November 2019 to date (accessed 5 August 2020 at 00:40)
Part 13 Division 3 Rule 224
224   Using horns and similar warning devices
A driver must not use, or allow to be used, a horn, or similar warning device, fitted to or in the driver’s vehicle unless—
(a)  it is necessary to use the horn, or warning device, to warn other road users or animals of the approach or position of the vehicle, or
(b)  the horn, or warning device, is being used as part of an anti-theft device, or an alcohol interlock device, fitted to the vehicle.
Maximum penalty—20 penalty units.
Note 1.
 Driver’s vehicle and alcohol interlock device are defined in the Dictionary and road user is defined in rule 14.
Note 2.
 Driver includes a person in control of a vehicle—see the definition of drive in the Dictionary.