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The Royal Commission for Riyadh City (RCRC) is building a new underpass at the intersection of King Abdulaziz Road and Anas bin Malik Road, as part of the Main and Ring Road Axes Development Program, according to the Saudi Press Agency. Traffic diversions started on 6 November 2026: the main carriageway of King Abdulaziz Road is fully closed, and traffic has moved to the service roads with three lanes in each direction. The section is 4.7 km long and includes four bridges in addition to the new underpass. On completion its capacity will exceed 450,000 vehicles a day. The program covers more than 500 km of roads across Riyadh. What it means for engineers: building an underpass beneath a major road while keeping traffic on the service roads makes the diversion plan a core part of delivery. No cost or completion date has been announced. What most reduces the impact of traffic diversions on residents while underpasses are built?
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