Every attempt should be made to incorporate facilities for health and safety protection of plant personnel in the original design. This include, but is not limited to, protected walkaways, platforms, stairs, and work areas. Physical hazard, if unavoidable, must be clearly defined. In such areas, means for egress must be unmistakable. All machinery must be guarded with protective devices. In all cases, medical services and first aid must be readily available for all workers.