Traffic is at a standstill in the eastbound lanes of Highway 20 after a truck hit the Highway 325 overpass.

The tractor-trailer jackknifed when it hit the overpass. 

The incident happened around 6:45 a.m. near Rivière-Beaudette, just two kilometres from the Ontario border. 

The driver was seriously injured. 

All eastbound lanes on Highway 20 are closed between the overpass and the border until further notice.

Transport Ministry officials are on site and a detour is being put in place.