Road Vehicles Lighting Regulations (Northern Ireland) 2000

12.  Other requirements—

(a)Every main-beam headlamp shall be so constructed that the direction of the beam of light emitted therefrom can be adjusted whilst the vehicle is stationary.

(b)Except in the case of a bus first used before 1st October 1969, where two main-beam headlamps are required to be fitted they shall form a matched pair.