According to OPP, a tractor trailer collided with a highway barrier in the express lanes. The area is expected to be closed for most of the day, Schmidt said. Drivers in the eastbound lanes of the highway can exit at Brock Road and get back on by taking the on-ramp and the off-ramp. For drivers in the westbound lanes, they will be forced off at Highway 412 but can get back on at Liverpool Road.