A yellow signal typically advises a train operator to do what?

A yellow signal is a critical indicator for train operators, signifying that they should proceed but with increased caution. It serves as a warning that the next signal could be red or that there may be conditions ahead that require the operator to be vigilant. This aspect of caution implies that while the train can continue moving, the operator should be alert to potential changes in the track or surrounding circumstances that may necessitate a quicker response.

Understanding the function of a yellow signal helps in maintaining safety on the rails, as it signals the crew to prepare for possible stops or decreases in speed while navigating through the area. Hence, proceeding with caution means the operator remains aware of their surroundings and is prepared for any necessary adjustments in speed or actions in response to upcoming signals or track conditions.