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For all D1 Grand Prix USA - Points Round and Exhibition Match Events
The following additional requirements must be met.
1. Each car must be equipped with a six-point or better roll cage. Full front A pillar beams are required as well as door impact protection beams.
2. Functional tow hooks must be installed on both front and rear of vehicle
3. Roll cage must be welded or securely bolted and anchored. If roll cage is bolted then its must be securely reinforced with an anchor plate and backing plate sandwich on each side of the floor pan.
4. Roll cage may be placed in front or through the dashboard.
5. Roll cage tubing must be at a minimum of 1.5 inches OD tubing and no thinner than 0.098 wall mild steel or 1 .25x .083 Chromoly tubing.
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