What do two yellow flags indicate to a train operator?

Two yellow flags indicate to a train operator that they should slow down to 15 mph. This signal is part of the visual indications used to communicate important instructions to train operators regarding the speed at which they should be operating their trains.

The use of yellow flags specifically conveys a cautionary message, alerting the operator that there may be a condition ahead requiring reduced speed. This may be due to track work, potential hazards, or other operational considerations. By reducing speed, train operators are better prepared to react to any unforeseen circumstances that may arise in the vicinity of the flagged area, ensuring the safety of both the train and its passengers.

Other options suggest different actions that do not align with the established protocol for yellow flags. For example, proceeding at normal speed would be inappropriate under cautionary signals, and stopping or preparing for a station stop does not correspond to the specific instruction aimed at reducing speed for safety measures.