Traffic was backed up for several kilometres after a tandem trailer rolled over on Highway 401 east of Grafton on Tuesday morning. It happened around 11 a.m. when a pickup hauling a tandem trailer loaded with dry cement and other construction items had to take evasive action due to an aggressive driver in the eastbound lanes near the Vernonville Road overpass. The trailer flipped over and the contents scattered across the highway. Traffic was backed up west of Grafton and some drivers backed up the on-ramp to avoid being temporarily delayed. OPP advise if anyone is caught backing up an on-ramp they could face charges. No one was injured.