Requirements about the use of headlamps and front fog lamps
28.—(1) Save as provided in paragraph (2), a person shall not use, or cause or permit to be used, on a road a vehicle which is fitted with obligatory dipped-beam headlamps unless every such lamp is kept lit—
(a)during the hours of darkness; and
(b)in seriously reduced visibility.
(2) The provisions of paragraph (1) do not apply—
(a)in the case of a motor vehicle fitted with one obligatory dipped-beam headlamp or a solo motor bicycle or motor bicycle combination fitted with a pair of obligatory dipped-beam headlamps, if a main-beam headlamp or a front fog lamp is kept lit;
(b)in the case of a motor vehicle, other than a solo motor bicycle or motor bicycle combination, fitted with a pair of obligatory dipped-beam headlamps, if—
(i)a pair of main-beam headlamps is kept lit; or
(ii)in seriously reduced visibility, a pair of front fog lamps which is so fitted that the outermost part of the illuminated area of each lamp in the air is not more than 400 mm from the outer edge of each vehicle is kept lit;
(c)to a vehicle being drawn by another vehicle;
(d)to a vehicle while being used to propel a snow plough; or
(e)to a vehicle which is parked.
(3) For the purposes of this regulation a headlamp shall not be regarded as lit if its intensity is reduced by a dim-dip device.