Unless otherwise provided elsewhere in these regulations, a lamp fitted to any vehicle shall emit a steady light when in operation: Provided that an ambulance, rescue vehicle, fire-fighting vehicle, a motor vehicle operated by a traffic officer in the execution of his or her duties, or a motor vehicle operated by a member of the Service or a member of a municipal police service, both as defined in section 1 of the South African Police Service Act, 1995 (Act No. 68 of 1995) in the execution of his or her duties, may be equipped with a device which enables the driver of such vehicle to operate the vehicle's head lamps in such a manner that they flash intermittently.