Requirements for Authorisation D Issue Date March 2019 70 Doorways positioned within them approach to the plate brake tester must beat least min width (to enable vehicles to be offset to test the single wheeled axle. Note: The brake testing facility must be able to cater with either a single front or rear wheel configuration. 6.5 Emissions Testing. Not required for Class 3 testing. 7. Dual Class Premises (Class 3 and 4) 7.1 Premises and equipment considered suitable for Class 4 testing will also be accepted for Class 3, and wheeled Class 4 testing if the underside inspection facility has the following a) A suitable method of supporting the 'single wheel' of any three wheeled vehicle on a firm surface and on a turning plate. A single wheel support must cater for single front or rear wheel configuration and there must be acceptable arrangements for testing headlamp aim, if applicable, for both wheel layouts b) Suitable jacking arrangements. If the jacking equipment is unsuitable for raising a 3 wheeler single wheel there must be suitable additional equipment of kg capacity.