any fire engine used for the purpose of extinguishing fires, of preserving life and property in case of fire or of aiding or rescuing persons in danger, or in case of an accident;
(b)
any ambulance used for the purpose of aiding or rescuing persons in danger, or in case of an accident; or
(c)
any motor vehicle owned by the Government and used by the Singapore Police Force or the Singapore Civil Defence Force for the purpose of executing the functions of the Singapore Police Force or the Singapore Civil Defence Force, as the case may be,
if compliance with this Notification is likely to hinder the use of the fire engine, ambulance or motor vehicle for the purpose for which it is being used.