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4.23.6 NECK COLLAR All cars running quicker than 9.99 seconds (1/4 mile or equivalent) and slower than 7.99 seconds (1/4 mile or equivalent) use of a commercially produced neck collar designed for racing is recommended but not mandatory. Several different types of neck collars are commercially available and acceptable, being a full 360-degree ‘donut’ type or a pull together ‘horseshoe’ type. A Frontal Head Restraint system is permitted in all applications where a neck collar is required. Must be worn as per manufacturer’s recommendations. Refer Class Requirements.
4.23.7 FRONTAL HEAD RESTRAINTS
GENERAL REGULATIONS
Any driver of a car running quicker than 7.99 (1/4 mile or equivalent) requires the use of a proprietary Frontal Head Restraint system meeting either SFI 38.1 or FIA 8858-2002 or FIA 8858-2010. The Frontal Head Restraint, when connected, must conform to the manufacturer’s instructions. A Frontal Head Restraint may be used with or without or in place of a neck collar. Where required, the fitment of tether post and eyelets to helmets must only be done in accordance with the manufacturers guidelines and only if the helmet is approved for the purpose. When using a Frontal Head Restraint, at all times that the driver is in the race vehicle, from when the vehicle is in the hands of The Starter until the vehicle is on the return road, the driver must properly utilise the Frontal Head Restraint, including connecting the helmet as required for full functionality of the device.
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