Highway 401 has reopened after a serious tractor-trailer crash created a traffic nightmare Monday morning, bringing commuters driving through midtown Toronto at a standstill for several hours. 

The highway reopened just before 10:30 a.m. The express lanes were closed for more than 10 hours between Highway 404 and Allen Road.  as crews cleaned the scene and police investigated what led up to the crash.

The accident happened just east of the Yonge Street exit around midnight when the westbound truck slammed into the barrier that separates the eastbound lanes from the collector route. The impact of the crash caused the truck to roll to its side and spill its load -- 5x10 sheets of particle board. Diesel fuel was also leaked on the highway.

No other vehicle was involved in the accident and the driver of the truck did not suffer any injuries, according to OPP Sgt. Dave Woodford.

The driver of the truck has been charged with careless driving, Woodford said.

The cleanup efforts were hampered overnight by freezing rain and then fog in the early morning hours. Transferring the truck's load onto another tractor trailer and hauling the vehicle away also takes time, said Woodford.

Woodford said police would like to talk to anyone who witnessed the accident take place. Witnesses can call the Ontario Provincial Police Toronto detachment at 416-235-4981.