The Sheriffhall Roundabout is known locally as the busiest roundabout in Scotland, assisting in the smooth flow of traffic into Edinburgh through the A720 and out again through the A7. In 2008 the twenty year old hot-rolled asphalt surfacing was coming to the end of its useful life and the decision was taken to increase the roads capacity by widening the approach carriageways and the roundabout itself by adding an extra lane.
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M1 junctions 28-31 smart motorway phase 2
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Project Horizon - Surrey County Council