A truck driver has been charged with careless driving after a multi-vehicle collision left Highway 401 eastbound express lanes at Leslie St. closed for almost 12 hours.

OPP Sgt. Kerry Schmidt said a transport truck driver slammed into slow traffic hitting three vehicles, including another truck carrying a carbon material that spilled all over the highway creating a huge mess.

The eastbound lanes finally opened shortly after 11 a.m. Monday.

Westbound lanes were also closed initially but opened at 3 a.m.