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4*6*3 Siting of Grade Separated Junctions<br />

4.6*3.1 Interchanges should not be sited where approach roads have long<br />

steep gradients which will materially slow heavy vehicles and<br />

cause them to bunch* For the same reason interchanges should<br />

also be avoided at the crest of hills where additionally,<br />

signing may be a problem as drivers atteapt to read signs<br />

silhouetted against the skyline*<br />

4*6*3.2 The siting of one interchange with respect to the adjacent ones<br />

will be governed by the requirements of minimum merging, weaving<br />

and diverging lengths as discussed in subsequent paragraphs*<br />

4*6*3*3 In urban areas interchange location should take account of the<br />

effect of its elevated structures on adjacent development* To<br />

protect the privacy of occupants, it is recommended that<br />

elevated structures should not be constructed closer than 20m to<br />

residential buildings. The nuisance caused by fumes, noise and<br />

visual intrusion should also be taken into account and<br />

minimised* For the operation of fire service appliances a<br />

minimum of 6m is required between elevated structures and all<br />

adjacent buildings*

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