15. Walkways: Walkways inside a building shall:1° be kept in good order and free from any obstruction;
2° be maintained to keep the surface from becoming slippery, even through wear or humidity;
3° be wide enough to allow the safe handling of materials and be at least 600 mm wide;
4° be at least 1,100 mm wide if they serve as direct access to an exit;
5° be clearly marked out by lines traced on the floor or be bordered by facilities, equipment, walls or material or merchandise depots, to permit the safe passage of persons;
6° have a free space of at least 2 m above the floor unless the danger is made known by means of a visible sign;
7° be free from any opening capable of causing an accident, unless they are protected with a guardrail or a cover capable of withstanding a load of at least 2,4 kN/m2.