What indicator signals that a train can proceed through a work zone?

The flashing green signals indicate that a train can proceed through a work zone. This type of signal is specifically used to communicate to the train crew that it is safe to advance, even when maintenance or construction work is taking place in the vicinity. Flashing green signals serve as a clear and standardized indication within rail systems, helping to ensure the safety of both train operations and the work being performed.

In many rail systems, different colored signals carry specific meanings, and flashing green is universally recognized as a go signal. This clarity is crucial in work zones where there may be increased risks due to ongoing construction activities, reduced visibility, or modified track conditions. It is essential for the train crew to be informed through reliable signaling so they can navigate safely and avoid potential hazards associated with work areas.