Level approach dimensions and gradients

A level approach should have – (a) an unobstructed width of not less than 1500 mm. However, at a local obstruction the width may be reduced to 1000 mm, provided that the length of the reduced width is not more than 6 m and the obstruction is protected by a suitable barrier; and (b) clear headroom of not less than 2100 mm. Where the level approach has a gradient steeper than 1 in 60 it should have horizontal rest areas, not less than 1200 mm long and a rise of not more than 500 mm between rest areas. Where the level approach is more than 50 m in length it should have passing places. These should be spaced at a distance of not more than 50 m with a clear line of sight between consecutive passing places. Every passing place should be not less than 1800 mm wide and not less than 2000 mm long therefore, the width of the passing place may include the width of the level approach. A level approach with a surface width of 1800 mm or more can accommodate non-vehicular traffic without the need for passing places. Where a level approach has a crossfall it should be not steeper than 1 in 40.