A reported crash and subsequent fluid spill is causing delays on westbound I-66.
The crash was first reported near the Glebe Road exist just after 2 p.m. Both lanes of the highway are now back open; previously, one lane had been closed.
As of 2:20 p.m. westbound traffic had backed up nearly to Rosslyn.
Virginia State Police and a towing crew are on the scene, with the vehicles involved on the shoulder of the highway. Absorbent material has been placed over the spilled fluid.