What indicates that movements over a switch in HAND operation must display?

In HAND operation, it is crucial for movements over a switch to display a stop indication. This is because HAND operation often involves manual control and communication between crew members, and a stop indication serves as a critical safety measure. It ensures that operators clearly signal to all involved parties that they should halt before proceeding over the switch, allowing for proper verification of the switch's position and overall safety of the operation. In situations where switching tracks or maneuvering equipment is involved, having a stop indication prevents potential accidents or collisions.

The other options do not fulfill the necessary safety requirements for movements over switches in HAND operations, as they do not provide the required pause to ensure safety checks can be conducted. A clear indication, go indication, or proceed indication may imply that it is safe to move, which contradicts the need for a thorough check typically associated with HAND operations.