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4,6.5 General Layout Requirements
4.6.5.1 Interchanges should be designed to cater primarily for the major
flows, with the through movements maintaining the design speed
selected for the through route between junctions. Geometric
parameters relating to turning movements should reflect the
magnitude of design flow for that movement.
4.6.5.2 Generous curvature, in for example 270° loops, can be wasteful
in land and capital costs and will not necessarily lead to low
operating costs, for the extra distance travelled at high speed
might outweigh slower speeds on a shorter tighter loop.
4.6*5*3 Decision points should be separated as much as possible and the
number of decision points in any one sequence kept to a minimum.
4*6.5.4 Consideration should be given to bus routes operating on the
major road to identify the need for bus stopping facilities
within or adjacent to the interchange.