Canada Occupational Health and Safety Regulations

2.8 Where one end of a stairway is so close to a traffic route used by vehicles, to a machine or to any other hazard as to be hazardous to the safety of an employee using the stairway, the employer shall, at that end of the stairway,

• (a) post a sign to warn employees of the hazard; and

• (b) where practicable, install a highly visible barricade that will protect employees using the stairway from the hazard.