What color represents a clear signal in subway sections?

In subway signaling systems, a clear signal is represented by the color green. This indicates that the train is authorized to proceed with no restrictions or delays. The use of green as a signal for 'go' is widely recognized in transportation systems, including railways, to ensure that operators can quickly and easily interpret the status of the tracks ahead.

The choice of green for a clear signal is based on its visibility and psychological association with safety and passage. Green light is typically seen as a positive indication, contrasting with other colors like red, which indicates a stop or danger, and yellow, which usually signifies caution or a warning to prepare to stop. Blue is often used for informational purposes or specific types of signals, but it does not indicate a clear path for operation.

Thus, recognizing green as the signal color for clear tracks is vital for safe and effective train operation.