6:20 p.m. Update: All lanes have reopened.
6:05 p.m. Update: The left lane has reopened. Emergency crews remain on the scene in the right lanes.
6 p.m. Update: Crews are hosing down the road surface as response vehicles continue to be removed from the roadway.
5:50 p.m. Update: Cleanup appears to be winding down. However, the road remains closed. Most of the emergency vehicles have been pulled to the shoulders. Interstate 66 to the east of the scene remains jammed.
5:15 p.m. Update: The cleanup continues almost four hours into the shutdown of Interstate 66. Emergency vehicles are on the scene, and drivers in the eastbound lanes will still have to contend with delays due to drivers gawking at the remains of the fire.
4:49 p.m. Update: Virginia State Police report that the northbound ramp from Route 123 to I-66 West is also closed. Authorities estimate the highway will remain closed for at least another hour.
State police spokeswoman Corinne Geller said the driver of the truck was not injured after the tractor-trailer carrying bales of hay caught fire. Virginia State Police reported to the scene about 1:30 p.m.
4:37 p.m. Update: The cleanup continues, and there is also a backhoe helping to scoop the debris into trash bins and dump trucks.
4:10 p.m. Update: Two skid loaders are being used to clear the highway, while emergency vehicles remain on the scene. The detour is still in place.
3:50 p.m. Update: Officials say it may still take one to two hours to clean up the scene.
3:40 p.m. Update: Emergency vehicles remain on the scene of the smoldering fire, with the remains of the truck appearing to stretch across the highway. Traffic is being diverted to Route 123.
3:10 p.m. Update: Expect some eastbound delays, too, mostly due to drivers looking at activity in the westbound lanes.
3 p.m. Update: The interstate remains blocked. Alternate routes into Virginia include Routes 50 and 29.
2:31 p.m. Update: VDOT says delays now extend almost five miles.
Original post: A truck carrying a load of hay overturned and caught fire on Interstate 66 westbound between Routes 123 and 50, according to traffic reporting services.
All westbound lanes are blocked, according to the Virginia Department of Transportation. Delays extend more than three miles, VDOT estimates.