What does a signal indicating "proceed with caution at allowable speed" suggest?

The phrase "proceed with caution at allowable speed" signifies to the train operator that they must continue moving, but they should do so carefully and at a maximum specified speed. The use of the word "caution" implies that there may be potential hazards or situations that require the operator to be vigilant while still permitting some movement. Therefore, this signal provides the operator with guidance on maintaining a safe speed while ensuring awareness of their surroundings.

This instruction is critical for maintaining safety on the tracks, particularly in areas where conditions may not be fully clear or where other train movements could affect operation. Following this direction allows for continued movement while prioritizing safety and adherence to operational protocols.