Traffic on both sides of Highway 400 near Mapleview Drive in Barrie, Ont. came to a grinding halt after a gravel truck collision late Thursday morning.
OPP Highway Safety Division Sgt. Kerry Schmidt said the transport truck rolled over the median wall south of Mapleview Drive near McKay Road, spilling gravel in both the northbound and southbound lanes.
Police closed two left lanes in both directions for the cleanup and recovery .

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Police said the incident damaged at least two other vehicles.
Only minor injuries were reported.

There's no word on what caused the truck to crash or if any charges will be laid.
The highway was fully reopened several hours later.