A large truck with its bed raised crashed into the overpass on Brien Boulevard on Highway 40 near Repentigny, just east of Montreal.
The incident happened just after 11:30 a.m.
The truck appeared to be travelling at a high speed, causing its entire contents, canola seeds, to explode out onto the highway upon impact.
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The truck was severely damaged.
The eastward direction of the highway has been closed for an indeterminate amount of time; the westbound lanes have since been reopened.
Officials were asking drivers to avoid the area.