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F.6.4.1 Frame Members of the Side Impact Structure must be constructed of closed section tubing meeting F.3.2.1.e or F.3.2.1.f for a Bent Upper Side Impact member
F.6.4.2 With proper Triangulation, Side Impact Structure members may be fabricated from more than one piece of tubing.
F.6.4.3 The Side Impact Structure must be comprised of three or more tubular members located on each side of the driver while seated in the normal driving position
F.6.4.4 The Upper Side Impact Member must:
a. Connect the Main Hoop and the Front Hoop.
b. Be entirely in a zone that is parallel to the ground between 240 mm and 320 mm above the lowest point of the top surface of the Lower Side Impact Member
The upper frame rail may be used as this member if it meets the height, diameter and thickness requirements.
F.6.4.5 The Lower Side Impact Structure member must connect the bottom of the Main Hoop and the bottom of the Front Hoop.
The lower frame rail/frame member may be this member if it meets the diameter and wall thickness requirements.
F.6.4.6 The Diagonal Side Impact Member must:
a. Connect the Upper Side Impact Member and Lower Side Impact Member forward of the Main Hoop and rearward of the Front Hoop
b. Completely Triangulate the bays created by the Upper and Lower Side Impact Members.