From the press release (bolding mine) Route 691 (Jarmans Gap Road) will be closed to traffic at the Route 240 (Crozet Avenue) intersection for five weeks beginning Sept.

…  Traffic traveling east on Route 691 will be detoured onto Old Trail Drive, then onto Route 250 east  and back onto Route 240 south of the Route 691 intersection. … That utility work is necessary prior to the beginning of construction of the Virginia Department of Transportation’s Jarmans Gap Road improvement project, which is scheduled to begin in the spring of 2011.   … Once completed Route 691 will have 12-foot wide travel lanes, a four-foot wide bicycle lane on each side of the road, curb and gutter on both sides of the roadway and sidewalk on the northern side of Route 691 .