Two lanes of westbound I-66 are closed prior to Sycamore Street due to an apparent gravel spill.

VDOT crews are on their way to the scene to clean up the loose gravel, but Arlington County officials say they don’t know long the clean-up will take.

Just before 9:30 a.m. a car slammed into the guardrail on westbound I-66 under the Patrick Henry Drive underpass, near the gravel spill. It’s not clear if the gravel caused or is somehow related to the accident.