It has been a while since I was sure I saw the remains of one of these (there have been several cases of muddy tracks this summer and last, but since the appeared when the grass was freshly mowed, I was thinking it was the Park Service mowing the steep hill and slipping in the mud). That streak seems to have ended.
Some time before Wednesday (12/2) morning, a vehicle drove off the GW Parkway, taking the “End Roadwork” sign down and travelled on or across the trail leaving bits of glass and other car parts on the trail.