Construction has begun on three interchanges along Interstate 81 in Shenandoah and Frederick Counties.

The upgrades include extension of acceleration or deceleration lanes at Toms Brook, Strasburg and at the scales on 81.

Virginia Department of Transportation (VDOT) warns of overnight lane or ramp closures to be aware of.

Motorist should watch for digital signage for detour routes where needed.

The projects are part of the $2 billion I-81 Corridor Improvement Program.

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