B-2.6.6.1 Where hazards on the direct line of pedestrian
travel such as stairs, escalators and moving walks or ramps with a slope of more than 1:16 cannot be avoided, tactile warning indicators and visual markings shall be provided. Every effort shall be exercised to obviate hazards to persons with disabilities.
B-2.6.6.2 Access panels in walls or manholes in walks, may be extremely hazardous, particularly when in use/open, and shall be avoided. When manholes or access panels are open and in use, or when an open excavation exists on a site, particularly when it is in proximity of normal pedestrian traffic, barricades shall be placed on all open sides, and warning devices shall be installed.