30 CFR § 56.16014
Operator-carrying overhead cranes
July 29, 2020
Operator-carrying overhead cranes shall be provided with—
(a) Bumpers at each end of each rail;
(b) Automatic switches to halt uptravel of the blocks before they strike the hoist;
(c) Effective audible warning signals within easy reach of the operator; and
(d) A means to lock out the disconnect switch.