a.
Where the cover is of a rigid material the edge is to be protected with non-flammable padding( see Chapter 7) Vehicles of Periods A to F exempt if proven that original manufacturer’ s design is maintaned and non-flammable padding is fitted.
2.6. Have any undertray provided with drainage holes to prevent accumulation of liquids.
3. A closed Vehicle must have: 3.1. Effective means of ventilating the passenger compartment.
3.2. Means of access on either side of the Passenger compartment operable from the inside and the outside and sufficient in size to remove the occupant without impedance by door locking devices.
3.3. It is recommended to have the Driver’ s window closed whilst racing – or that suitable netting should be installed in the window opening to act as a restraint to stop the Driver’ s arms or head inadvertently emerging from the Vehicle.
3.4. Other than a road going Vehicle have bonnet security clips fitted.
4. Seating 4.1. Not carry anyone other than the Driver whilst on Track except with the permission of the ASN.
5. Brakes
5.1. Be equipped with brakes which comply with Statutory Requirements as to the construction and use of Motor Vehicles or if there is no mechanical system available for applying braking effort to at least two wheels there must be two hydraulic systems so that in event of failure of one system braking is maintained on at least two wheels.
5.2. Vehicles constructed after 1930 must have brakes on all wheels.
5.3. The braking system on all Vehicles must be capable of demonstrating its efficiency without impairing the Driver’ s control when tested immediately prior to an Event.
5.4. It must be possible under all conditions running or stationary for 25 % minimum braking effort to be applied by the Driver through the braking system to each axle.( Vehicle models introduced prior to 31.12.65 are exempt from this requirement.)
5.5. Brake balance adjusters must not be available for adjustment during running if they contravene Art. 5.4 above.
5.6. Not be fitted with Anti-Locking braking devices unless a Production Car with the device fitted as standard equipment by the manufacturer.
6. Wheels
6.1. Have any spare wheels securely fastened in position( a spare wheel need not be carried unless specified in the Official Documents)
6.2. Have all nuts securing road wheels excepting those of centre-lock type of steel and in thread contact over a minimum length of 1½ bolt / stud diameters. Extended or composite wheel bolts / studs are prohibited. Vehicles of periods A to D are exempt from this requirement.
7. Tyres 7.1. Use only tyres as specified by Tyre Regulations.
7.2. Remould or retread tyres are prohibited unless listed in Chapter 8 or the Vehicle was constructed prior to 1940.
Motorsport UK 2025 National Competition Rules Version 11
Chapter 12 Appendix 13- Competitors Vehicles Technical Regulations 428