Protective headgear
4.—(1) Save as provided in paragraph (2), every person driving or riding (otherwise than in a side-car) on a motor bicycle when on a road shall wear protective headgear.
(2) Nothing in paragraph (1) shall apply to any person driving or riding on a motor bicycle if—
(a)it is a mowing machine; or
(b)it is for the time being propelled by a person on foot.
(3) In this regulation—
“motor bicycle” means a two-wheeled motor cycle, whether or not having a side-car attached, and for the purposes of this definition where the distance measured between the centre of the area of contact with the road surface of any two wheels of a motor cycle is less than 460 millimetres, those wheels shall be counted as one wheel;
“protective headgear” means a helmet which—
either—
bears a marking applied by its manufacturer indicating compliance with the specifications contained in one of the British Standards (whether or not as modified by any amendment) mentioned in Schedule 2 to these Regulations; or
is of a type manufactured for use by persons on motor cycles which by virtue of its shape, material and construction could reasonably be expected to afford to the wearer a degree of protection from accidental injury similar to or greater than that provided by a helmet of a type prescribed by regulation 5;
if worn with a chin cup attached to or held in position by a strap, is provided with an additional strap (to be fastened under the wearer’s jaw) for securing the helmet to the head; and
is securely fastened to the head by means of straps provided for that purpose; and
“strap” includes any fastening device.