Everywhere we work there is a 'floor'. It may be a carpeted office floor, or a brick sidewalk, or even a rooftop. Keeping this 'floor' safe for walking and working is a daily effort. Specific requirements include:
Indoor hallways must have a minimum width of 44 inches that is clear of obstructions. (In other words, storage in a hallway may not reduce that hallway below 44 inches of travel space.)
Cords, cables, and hoses that cross a walkway must be covered to prevent people from tripping over them. This is commonly accomplished with a rug or cable protectors.
Edges with a four foot or greater drop off must be protected with some sort of barrier to prevent falls off the edge.