Global News At 5:30Toronto February 25 2019 10:30pm 01:25 Highway 400 reopens after pileup involving dozens of vehicles A scene of carnage unfolded on highway 400, prompting a temporary closure. Dozens of vehicles were involved. Shallima Maharaj has the latest. More than 70 vehicles involved in collision on Hwy. 400 near Barrie, Ont. Responsive site?