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It's because the second carriageway was built two decades after the first one. Initially the single-carriageway highway was just there to relieve traffic on the Anchieta highway. Then they decided to add a second one. I assume that by the time the second carriageway was built, tunnel construction technology had improved, allowing a different route for tunnels, which in turn resulted in the second carriageway coming out of the mountain at a different angle than the first. Or perhaps the steepness of the mountains didn't allow to build such wide roads side-by-side.
Cambrasa02:38, 14 April 2008 (UTC)reply