What does a signal indicating 'proceed with caution on main route' instruct the train operator to do?

A signal indicating 'proceed with caution on main route' instructs the train operator to move forward but to do so with an increased level of awareness and readiness to respond to any potential hazards. This message emphasizes the need to be vigilant for any conditions that may require slowing down or stopping, such as track obstructions, changes in track conditions, or upcoming signals.

In operational terms, this instruction means that while it is safe to continue on the main route, the driver should not assume that everything is normal. Instead, they should be prepared for unexpected situations, which could include narrowing of the tracks, maintenance work, or approaching other trains.

Following this guidance ensures safety and helps maintain effective train operations, especially in areas where visibility may be limited or where there may be other risks involved. Thus, proceeding with caution reflects a responsible adherence to safety protocols rather than ignoring potential dangers.