Article 5 Exemptions relating to facilities for disabled persons
Subject to article 6, an exempt vehicle is authorised to be used for carriage on the Northern Line, even if it does not conform with, or is used in a manner that does not conform with, the requirements of—
(a)
paragraph 8(6)(a) (width of contrasting colour floor strip at passenger doorways of a vehicle), but only in so far as it applies to single doorways with tapered door sills on those vehicles;
(b)
paragraph 11(5) (passenger information when vehicle is stationary at a station), but only in so far as it applies to the systems inside the vehicle.