February 14, 6:20 AM. Calgary Police are currently investigating a motor vehicle collision involving serious injuries. The collision is southbound on Deerfoot Trail between McKnight Boulevard and 32 Avenue NE. The collision is in the east lane which is currently shut down. Traffic will be congested and slow through that area. Motorists are advised to avoid the area by exiting off of southbound Deerfoot before McKnight. Remember to slow down and watch out for emergency workers on the roadway.