Which of the following is NOT a reason for using railway signals?

Using railway signals serves several critical functions in ensuring the safety and efficiency of train operations and worker protection. The primary purpose of railway signals is to indicate train movements, showing not only when it is safe for trains to proceed but also when they should stop or slow down. Signals provide vital information regarding operational statuses, such as track conditions and signal aspects, that help both train engineers and roadway workers make informed decisions.

Furthermore, signals play an important role in enhancing worker awareness of their surroundings. They help workers understand the movement of trains in their vicinity, which is essential for maintaining safety on or near the tracks.

In contrast, regulating the number of workers on the track is not a function typically associated with railway signals. Instead, worker regulation generally relies on other safety protocols and communication systems, such as flagging, the use of designated work zones, and adherence to established clearance procedures. This is to ensure that the safety of workers in the railway environment is managed effectively and is separate from the signaling system, which focuses more on train operations than worker presence.