An air ambulance crew takes off after a pileup results in serious casualties; Preferred fights to clear two wrecks blocking the road to the border; a veteran operator rescues a leaning trailer.

Herb's team fights fire while tussling with a burned-out semi; as whiteouts rage across the 402 in Sarnia, Mark fights his way through a long backup to reach a job; a unique recovery crew faces a heavy load of peat moss and trailer ready to split.