Transports Quebec is urging drivers to avoid the interchange for Highways 20 and 30 at Boucherville. 

Both highways will be closed at the junction as of 8:30 p.m. tonight for the demolition of an overpass. 

Highway 30 is expected to reopen around 12 p.m. on Sunday and Highway 20 won't reopen before 3:30 p.m. on Sunday.