Rebuilding the Wilson Bridge and four nearby interchanges was one of the nation’s biggest transportation projects. (Robert Thomson/The Washington Post)

Virginia, Fairfax County and Alexandria officials plan to hold a ceremony Thursday afternoon marking completion of the Telegraph Road interchange reconstruction, the last major phase of the Woodrow Wilson Bridge project, which involved building not only the bridge but two interchanges on each side of the Potomac River.

Over the years, some travelers have asked why the Telegraph Road interchange was taking so long, but this work, which began in 2008, was long designated as the last phase of the overall project. It has been completed on time, and caps one of the region’s transportation success stories.

This part of the job was quite complex. It involved widening a two-and-a-half-mile section of the Capital Beltway, which extended the THRU and LOCAL lanes west from the bridge. Elevated ramps were built to link the Beltway with Telegraph Road, Eisenhower Avenue and nearby streets. Also, the Telegraph Road bridge over the railroad and Metro tracks north of the Beltway was rebuilt to improve traffic flow along the corridor.