12/19/2013 06:19 EST | Updated 02/18/2014 05:59 EST

Highway 401 crash in Pickering snarls westbound traffic

A multi-vehicle collision involving a tractor-trailer is snarling westbound traffic on Highway 401 at Whites Road in Pickering.

The right express lane is blocked and the two left lanes appear to be blocked in the collector lanes.

CBC has sent a reporter to the scene and will have updates throughout the morning.

More to come