Along runs and landings, the minimum clear width must be measured between the leading edge of handrails Boarding and alighting areas shall provide a clear length of 2.4 m (8.0 ft) minimum, measured perpendicular to the curb or street or highway edge, and a clear width of 1.5 m (5.0 ft) minimum, measured parallel to the street or highway. This also applies to landings required to be at least 60″ by 60″ where ramps change directions so that the minimum landing area remains clear.
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At this stage, it is clear that as1428.1:2009 strictly requires the width of a curved ramp to be 1500mm between handrails
Curved ramps require practical consideration of a minimum width that facilitates an accessible path of travel.
Existing elevator cars shall be permitted to provide a clear width 36 inches (915 mm) minimum, clear depth 54 inches (1370 mm) minimum, and a net clear platform area 15 square feet (1.4 m2) minimum. Except as provided in r302.2.1 and r302.2.2, the continuous clear width of pedestrian access routes shall be 48 inches (1220 mm) minimum, exclusive of the width of any curb.
