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T.P.B.M.7.2.4
4.6 Grade Separated Junctions
4.6.1 Introduction
4.6.1.1 Grade separated junctions occur where some or all of the
intersecting roads pass each other at different levels and some
or all of the turning movements are catered for by ramps
connecting the two levels.
4.6.1.2 Compared with other junction types, grade separated junctions
offer increased capacity, less vehicular delay, fewer accidents
and reduced operating costs* These benefits are offset by the
high construction costs and usually increased land take. Land
take, which is of prime importance in the vast majority of
locations in Hong Kong, can however be minimised with prudent
design. Junction layouts should be as compact as possible
within the limitations imposed by the minimum geometric
standards discussed in subsequent paragraphs.
4.6.1.3 The layouts and standards recommended in this section are most
appropriate to trunk road and primary distributor junctions
where most grade separated layouts may be expected.