A person who holds a trade licence or trade licences and uses

(a) at any one time on a road, a greater number of motor vehicles than the person is authorized to use by virtue of the trade licence or licences,

(b) a motor vehicle on a road for any purposes other than a purpose which has been prescribed by Regulations, or

(c) the trade licence, or any of the trade licences, for the purposes of keeping on a road in any circumstances other than circumstances which have been prescribed, a motor vehicle, which is not being used on that road commits an offence and is liable on summary conviction to a fine of not less than 500 penalty units and not exceeding 1000 penalty units or to imprisonment for a term not exceeding 3 years or to both.