22.5. Must not be a Vehicle of commercial type such as a van / pick-up which was initially intended solely for commercial or goods carrying unless permitted by the Official Documents.
22.6. Must have a minimum distance of 1830mm between the centre lines of the foremost front and rearmost rear substantial load-carrying wheels unless complying with an Approved Formula or being a standard production Vehicle.
22.7. Except for racing cars must be fitted with a windscreen.
22.8. If plastic windscreen side screens or rear windows are fitted the thickness must not be less than nominal 4mm( minimum 3.8mm). Except for Vehicle models originally in production prior to 1st January 1990 for new build Vehicles from 2022 they must be Polycarbonate with a nominal thickness of 6mm( minimum 5.8mm) for the windscreen.
22.9. Sports Vehicles supplied as standard with plastic side screens may retain them in their original thickness.
22.10. Must not have skirts bridging devices or any form of aerodynamic device between the Chassis and the ground / Track.
22.11. Any specific part of the Vehicle influencing its aerodynamic performance must:
a. b. comply with rules relating to bodywork and be rigidly secured to the entirely sprung part of the Vehicle and c. remain immobile in relation to the Vehicle.
22.12. Ground Clearance: No part of the Bodywork or of the suspended part of the Vehicle can be below a horizontal plane passing 40mm above the ground( unless stated otherwise in Official Documents) the Vehicle being in normal racing trim with the occupants aboard.
22.13. A gauge conforming to ASN Technical requirements may be used by Scrutineers at any time during an Event to check Vehicle ground clearance. This should normally be on a recognised flat area when the Event is at a Race Circuit.
22.14. Must not carry or pass any liquids or gases other than air at atmospheric pressure in or through any tubes comprising part of the Chassis structure.
22.15. It is strongly recommended for all Competitors except Autotest participating in single Venue Competitions to have available at their paddock base and for multi-Venue Competitions to carry within their Vehicle a self-contained Spill Kit capable of effectively absorbing minor spillages of up to 1.25 litres of all Vehicle fluids – oils fuels coolants battery acid. For Autotest an adequate quantity of Spill Kits must be available with the Organisers at the Event control.
22.16. Used Spill Kits are to be disposed of in accordance with local or National guidelines and or Venue Regulations. They must not be disposed of in general waste facilities at the Event.
22.17. Information devices( including but not limited to):
a. b. c. data loggers displays instrumentation d. communication systems( where permitted) e. trip computers
Motorsport UK 2025 National Competition Rules Version 11
Chapter 7 Appendix 2- General Technical Regulations 247