What are Interlocking Signals primarily used for?

Interlocking signals are primarily designed to control train movements at junctions and crossings. Their primary function is to ensure safe and efficient operation of trains by coordinating the movements of multiple tracks and routes. When a train approaches an intersection or junction, the interlocking system manages which signals are displayed to ensure that no conflicting movements occur that could lead to accidents. This ensures that trains can safely proceed through complex track layouts without the risk of collisions, keeping both trains and passengers safe.

The other options, while related to train operations, do not capture the specific purpose of interlocking signals. For instance, displaying speed limits involves different kinds of signals that inform train operators of the maximum safe speed; managing train schedules pertains to timetabling and dispatching rather than directly controlling train movements; and informing conductors of track conditions relates to maintaining awareness of environmental factors, which is not the primary role of interlocking signals. Thus, the focus of interlocking systems on managing junctions makes this answer the most accurate.