A person shall not drive on a road a motor vehicle of a class specified in the first column of the following Table if he is under the age specified in relation thereto in the second column of that Table.
Regulations may provide that in relation to motor cycles or, if it is so prescribed by the regulations, in relation to motor cycles of a class so prescribed, the foregoing Table shall have effect as if it specified such minimum age as may be so prescribed, not being less than—
(a) 16 years, in the case of motor cycles other than those of the class specified in the following paragraph;
(b) 15 years, in the case of motor cycles whereof the cylinder capacity of the engine does not exceed 50 cubic centimetres, being cycles equipped with pedals by means whereof they are capable of being propelled ;
but a person shall not be prohibited by virtue of regulations having effect by virtue of this subsection from driving motor cycles of any class if at any time before the coming into force of the regulations he has held or was entitled (on making the requisite application and declaration and on payment of the appropriate fee) to the grant of a licence, other than a provisional licence, authorising him to drive that class of motor cycle or if at the time of the coming into force of the regulations he holds a provisional licence.
Regulations may provide—
(a) that the age under which a person may not drive on a road a motor car constructed as mentioned in section 190(9) of this Act shall, if the motor car is of a class specified in the regulations, and is driven with a trailer attached to it in the manner mentioned in that subsection, be 21 instead of 17 ;
(b) that the age under which a person may not drive on a road a tractor used primarily for work on land in connection with agriculture shall, if the tractor is of a class specified in the regulations and is driven in circumstances so specified, be 16 instead of 17;
(c) that the age under which a person may not drive on a road a road roller falling within paragraph 4 of the Table set out in subsection (1) above shall, if the roller is of a class specified in the regulations and is driven in circumstances so specified, be 17 instead of 21 ;
but—
A person who drives, or causes or permits a person to drive, a motor vehicle in contravention of the provisions of this section shall be guilty of an offence.