Two incidents with tractor-trailers caused major delays in Montgomery and Roanoke counties on Thursday afternoon.
Virginia State Police and the Fort Lewis Volunteer Fire Company responded to a truck that caught fire on I-81 northbound in Roanoke County near mile marker 131 and the Dixie Caverns exit. Crews extinguished the fire, and no injuries were reported.
Later in the afternoon, a wreck involving a tractor-trailer shut down both northbound lanes at mile marker 127.7.
Traffic began flowing again early Thursday evening.