A transport truck driver was pronounced dead at the scene of a single vehicle collision on the HWY 401 through Kingston, Ont. on Thursday.

On May 11, 2017, the unthinkable happened on a stretch of one of Canada's busiest highways: a 7-vehicle pileup on highway 401 westbound, taking the lives of four people and seriously injuring two others.

Police said seven vehicles were involved in the crash including four tractor-trailers, a commercial truck and two passenger vehicles.