Section 36(5)(d) in New Town Kolkata Planning Area (Building) Rules, 2014
(d)in case the parking area in the basement is less than 1000 Sq.M., only one ramp will be required. In case the parking area in the basement is more than 1000 Sq.M. at least two ramps should be provided. Width of each ramp shall not be less than 4.0 m. and the slope shall not be steeper than one vertical to six horizontal and the distance between the ramps shall be such as may be approved by the Sanctioning Authority;