7.4. For vehicles fitted with a pla

7.4. For vehicles fitted with a platform lift at the rear, the underrun device may be interrupted for the purposes of the mechanism. In this case, the following special requirements apply:7.4.1. The maximum lateral clearance measured between the elements of the underrun device and the elements of the platform lift, which move through the interruption when the lift is operated and which make the interruption necessary, may amount to no more than 2.5cm.7.4.2. The individual elements of the underrun protection, including those outboard of the lift mechanism, where provided, shall have an effective surface area, in each case, of at least 420cm2.7.4.3. For cross-members with a section height of less than 120mm, the individual elements of the underrun protection, including those outboard of the lift mechanism, where provided, shall have an effective surface area, in each case, of at least 350cm2.7.4.4. In the case of vehicles having a width of less than 2,000mm and where it is impossible to achieve the requirements of Paragraphs 7.4.2. and 7.4.3., the effective surface may be reduced on the condition that the resistance criteria are met.