Which signal indicates trolley operation most clearly?

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Multiple Choice

Which signal indicates trolley operation most clearly?

Explanation:
Signals are assigned to distinct motions on an overhead crane: moving the trolley, traveling the whole crane, hoisting up or lowering the load, and stopping in an emergency. The signal for trolley is the clearest way to indicate that only the trolley should move along the bridge, because it directly names the motion you intend—trolley movement. Using the travel signal would move the entire crane along the runway, which is different from moving just the trolley. Lowering controls vertical load movement, not horizontal trolley travel. An emergency stop halts all motion and is used only to stop operations in danger, not to request trolley motion.

Signals are assigned to distinct motions on an overhead crane: moving the trolley, traveling the whole crane, hoisting up or lowering the load, and stopping in an emergency. The signal for trolley is the clearest way to indicate that only the trolley should move along the bridge, because it directly names the motion you intend—trolley movement. Using the travel signal would move the entire crane along the runway, which is different from moving just the trolley. Lowering controls vertical load movement, not horizontal trolley travel. An emergency stop halts all motion and is used only to stop operations in danger, not to request trolley motion.

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