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Handbook for Playground Safety <br />• The use zone should extend a minimum of 6 feet from the <br />perimeter of the supporting structure. This 6-foot zone <br />may overlap that of an adjacent swing structure or other <br />playground equipment structure. <br />5.3.8.5 Protrusions on suspended members of <br />swing assemblies <br />Protrusions on swings are extremely hazardous because of <br />the potential for impact incidents. Nothing, including bolts <br />or other parts, on the front, back, or underside of a swing <br />should stick out more than 1/8 of an inch. See test proce- <br />dures in Appendix B. <br />5.3.9 Fall height and use zones not specified <br />elsewhere <br />Most playground equipment belongs in one of the categories <br />listed above. If it does not, the following general recommen- <br />dations should be applied: <br />• The fall height of a piece of playground equipment is the <br />distance between the highest designated playing surface <br />and the protective surface beneath it. <br />• The use zone should extend a minimum of 6 feet in all <br />directions from the perimeter of the equipment. <br />• The use zones of two stationary pieces of playground <br />equipment that are positioned adjacent to one another <br />may overlap if the adjacent designated play surfaces of <br />each structure are no more than 30 inches above the pro- <br />tective surface and the equipment is at least 6 feet apart. <br />• If adjacent designated play surfaces on either structure <br />exceed a height of 30 inches, the minimum distance <br />between the structures should be 9 feet. <br />• Use zones should be free of obstacles. <br />40 <br />