Final answer:
Safety regulations require the use of ladders or steps for trenches that are over 4 feet deep to ensure the safe entry and exit of workers.
Step-by-step explanation:
Ladders or steps must be used to enter trenches more than 4 feet deep. This safety requirement is part of the regulations set forth by occupational health and safety authorities such as OSHA (Occupational Safety and Health Administration) in the United States. When working in trenches, it is paramount to follow these safety guidelines to prevent accidents and ensure safe working conditions.
Ladders or steps are used to enter trenches more than 4 feet deep.
To enter trenches more than 4 feet deep, ladders or steps are usually used. These structures help individuals safely descend into and ascend from deep trenches by providing stable support and a convenient means of climbing. Ladders and steps are designed to meet safety standards and regulations to prevent accidents and injuries.