An accident on Interstate 81 in Botetourt County looks likely tie up northbound traffic for a while. It’s at milemarker 162 near Buchanan, and a VDOT traffic cam shows a tractor trailer into a guardrail and blocking the right hand lane. Expect growing northbound slowdowns between Troutville and Buchanan. As of 6:05 pm, VDOT traffic cameras now show the backups reaching the Troutville Rest area at milemarker 158.