Section 130 of the Act of 1992 is hereby amended -

(a) by the substitution of the following definitions for the definitions of "category A vehicle", "category B vehicle" and "category C vehicle":

"'category A vehicle' means a vehicle other than a category D vehicle, a motor-cycle or a listed vehicle -

(a) which is designed, constructed or adapted, solely or mainly for the carriage of the driver alone or the driver and one or more other persons, or

(b) which is of not more than 3 tonnes unladen weight and has, to the rear of the driver's seat, a roofed area -

(i) which is fitted with one or more side windows, or

(ii) in which openings, suitable for the fitting of side windows, are or were incorporated and are not closed and sealed in accordance with such conditions as may be prescribed, or

(iii) in which one or more seats have been fitted or in which are provided fixtures or other devices for the purpose of fitting one or more seats, or

(iv) in which the floor is constructed or fitted otherwise than in accordance with such conditions as may be prescribed;