Dual Carriageway 

Dual carriageways can have very complex geometry with different horizontal and vertical alignments for each carriageway. This introduces various width and height differences at the median. Devotech iDAS has a tool to link profiles dynamically to corridors which allows it to link the median geometry to carriageways so that the entire corridor updates automatically. Other tools allow the user to link drainage and guardrail details in the profile views (longsections) dynamically to the corridor.

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Devotech iDAS also provides various subassemblies which can be used for the dual carriageways:

• Lane subassembly which has inside and outside width and shift width

• Median subassembly with retaining wall which automatically creates channel, barrier or barrier with retaining wall according to the vertical difference between carriageway’s inside edges

• Cut/fill subassembly based on SANRAL (South African Road Agency) requirements