King Abdullah Road Interchange
Three and a half kilometres of grade-separated interchange rebuilt underneath live traffic, without ever closing the road.
The challenge
King Abdullah Road carries roughly 140,000 vehicles a day and there is no parallel route that can absorb it. The interchange had to be demolished and rebuilt in place, at grade and above it, while every one of those vehicles kept moving.
Our approach
We built it in eleven separate traffic stages, each one surveyed and rehearsed before the cones moved. No stage reduced the road below two lanes in either direction, and every switch happened between 1am and 4am on a Thursday.
The bridge decks were precast in a yard off site and lifted in overnight, which took the deck construction off the critical path entirely and removed months of falsework standing over live lanes.
The outcome
Opened five weeks early with no unplanned closures across the whole programme. The municipality has since used our traffic-staging methodology as a reference for two further interchange contracts.
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