A pileup on the 401 brings traffic to a standstill and pushes the Ross crew into action; Sonny helps a driver stuck on a dangerous stretch of highway in Toronto; Herb's rookie Zach masters a difficult move for the first time.

Eric is still working to find his place on the new County/Coxon team when a T-bone semi collision spurs them into action; with his first baby on the way, a blizzard in the east sends Andrew on an urgent rescue mission.