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.

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—

  1. a

     either—

     1. i

        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

     2. ii

        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;

  2. b

     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

  3. c

     is securely fastened to the head by means of straps provided for that purpose; and

• “strap” includes any fastening device.