Quote:
[R27]
Robots are required to use Bumpers to protect all exterior vertices of the Frame Perimeter. For adequate protection, at least 8 in. of Bumper must be placed on each side of each exterior vertex (see Figure 4‑1, Figure 4‑2, and Figure 4‑3).
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Since the exterior vertex is the corner of the frame, that means 8" of frame, not bumper