What function is performed by a lever locking feature in a tower operation?

The lever locking feature in tower operation primarily serves to maintain signal safety. This mechanism ensures that once a lever is put into a specific position, it cannot be inadvertently moved or adjusted without proper authorization or action from the operator. By securely locking the lever, the system helps prevent accidental changes to signals that could lead to miscommunication or unsafe conditions on the tracks and airspace.

This functionality is critical for preventing incidents in busy operation environments where multiple signals and aspects need careful coordination. Maintaining signal safety is vital for the protection of personnel, equipment, and the efficient operation of traffic.