Article 5
In relation to a control device fitted to a door between a passenger saloon and a vestibule adjoining a doorway in the side of a vehicle, the exemption given by article 4(2)(b) above shall only apply while instructions for the operation of the door in question are displayed on a sign—
(a)
placed on or near that door and on the same side of the door as the control device in question; and
(b)
on which the letters, numbers or diagrams which constitute the instructions contrast with their background and are identifiable by touch.