Hong Kong Regulations

BUILDING (PRIVATE STREETS AND ACCESS ROADS) REGULATIONS - REGULATION 13

Vertical curves

Any vertical curve in a private street, cul-de-sac or access road shall be
such that from a point 1 m above any part of the carriageway thereof a clear
view can be obtained of the top of an object 1 m high at all distances along
the carriageway up to 40 m from such point. (L.N. 294 of 1976)