What is the proper whistle signal for approaching workmen?

The proper whistle signal for approaching workmen is characterized by two long sounds followed by one short sound and concluding with another long sound. This combination is standardized to ensure clarity and safety around construction sites or areas of active work, allowing workers to be alerted effectively. The use of distinct patterns in whistle signals provides an efficient means of communication over distances and noise, making it crucial for maintaining a safe working environment.

In this case, two long whistles signal the approach of a train or vehicle, while the short sounds provide a warning tone, allowing workers time to react and prepare for the impending movement. The final long whistle serves as a confirmation of the alert, reinforcing the need for workers to stay vigilant. Understanding the significance and structure of these signals is essential for workplace safety and effective communication in environments where machinery and personnel are co-located.