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T.P.D.M.V.2.4<br />

Capacity of Grade Separated Junctions<br />

The capacity of a grade separated interchange is governed by the<br />

capacity of the individual merging, diverging and weaving<br />

sections within that interchange. Based on limiting values of<br />

main line flow, link flow and merging, diverging or weaving<br />

capacities, standard layouts are recommended which can cater for<br />

different combinations of major and minor route design flows.<br />

The method by which design flows are derived, and then applied<br />

to produce a layout with adequate capacity, is covered<br />

separately for merging lanes, diverging lanes and weaving<br />

sections under those respective headings, in subsequent<br />

paragraphs.

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