What does the signal aspect mean when it indicates to proceed on a diverging route?

When the signal aspect indicates to proceed on a diverging route, it means that the train is being given permission to move onto an alternate track that diverges from the main line. This aspect often comes with the expectation that the following signal will also indicate a clear path, allowing the train to continue its journey without needing to stop. Thus, option A is correct as it aligns with the operational principles of train signaling, where a clear indication is communicated to the train operator, facilitating safe and efficient movement through diverging track sections.

In this context, the other options do not align with the purpose of the diverging route signal. For example, stopping immediately or preparing for a sudden stop (as suggested in other options) contradicts the intent of allowing a train to proceed. Maintaining current speed might suggest a lack of change or action, which does not accurately reflect the transition required when moving onto a diverging route.