What does "ample time" require for the safety of workers?

The requirement for "ample time" is crucial for the safety of workers on or near the tracks. The correct choice states that workers should be in a position of safety not less than 15 seconds before a train passes. This guideline is rooted in the need for sufficient time to safely clear the tracks and avoid any potential accidents. Trains can approach unexpectedly, and they often cannot be stopped quickly due to their size and weight. Having a buffer of at least 15 seconds allows workers to react appropriately, ensuring that they can move to a safe location before a train arrives.

This time frame is established based on operational practices that evaluate the speed of approaching trains and the reaction times necessary for workers to safely vacate the area. It provides an essential margin for safety that contributes to protecting individual workers and reducing the risk of incidents in areas where trains operate.