The Zanesville Highway Patrol says an accident closed a major Muskingum county road for five hours today. Troopers say state route 60 North near the Muskingum County Speedway was closed after a semi tractor-trailer overturned. Officers say it was carrying a large load of plastic pipe. The accident happened just south of Mcglade School Road just before 10:30 this morning. The Highway Patrol says the road was re-opened at 3:30 this afternoon. No word on the casue of the accident.