The four-way stoplight at the intersection of Virginia Routes 9 and 287 in northern Loudoun County has long been a chokepoint for commuters, including some traveling from Frederick County, Maryland, and Jefferson County, West Virginia.

A major road project — construction of a roundabout to keep future commuters on both two-lane highways moving — is getting underway, but will cause disruption for drivers through summer 2027.

Data from Loudoun County said traffic volume at the Route 9 (Charles Town Pike) and Route 287 (Berlin Turnpike) intersection increased from an average of 13,000 vehicles per weekday in 2001 to 18,000 vehicles per day in 2018.

Many of the early-morning and late-afternoon commuters are traveling to employment centers in Leesburg, Ashburn, Sterling and other Northern

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