R401 *Bumpers should protect all corners. Robots are required to use Bumpers to protect all outside corners of the Frame Perimeter. For adequate protection, at least 6 in. (~16 cm) of Bumper must be placed on each side of each outside corner (see Figure 9‑3) and must extend to within ¼ in. (~6 mm) of the Frame Perimeter corner. If a Frame Perimeter side is shorter than 12 in. (~31 cm), that entire FRAME PERIMETER side must be protected by a Bumper (see Figure 9‑4). A round or circular Frame Perimeter, or segment of the Frame Perimeter, is considered to have an infinite number of corners, therefore the entire frame or frame segment must be completely protected by Bumpers.
The dimension defined in this rule is measured along the Frame Perimeter. The portion of the Bumper that extends beyond the corner of the Frame Perimeter is not included in the 6 in. (~16 cm) requirement. See Figure 9‑3.
Figure 9‑3 Bumper corner examples
Figure 9‑4 Bumper around full side/corner
