Final answer:
When working in a trench that is 4 feet or more in depth, safety regulations require a means of egress within 25 feet to ensure a quick and safe exit in case of an emergency.
Step-by-step explanation:
If you are working in a trench 4 feet or more in depth, you must have a means of egress within 25 feet of where you are working. This requirement is in place to ensure the safety of workers and to enable a quick exit in case of an emergency, such as the trench collapsing. Most workplace safety regulations, like those from the Occupational Safety and Health Administration (OSHA), specify these kinds of rules to prevent accidents and injuries.