36 CFR Part 1190, Proposed Accessibility Guidelines for Pedestrian Facilities in the Public Right-of-Way: Notice of Proposed Rulemaking (NPRM)
R403.4 Operation. Operable parts shall be operable with one hand and shall not require tight grasping,pinching, or twisting of the wrist. The force required to activate operable parts shall be 22 N (5 lbs) maximum.
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