A semi-truck crash shuts down a crucial border route; rookie heavy rescue driver Sonny helps a trucker stuck on a dangerous stretch of highway; a tanker wreck causes commuter chaos in Toronto.

Rookie Sonny faces a 40-car pile-up that turns a major highway into a war zone. A fierce storm triggers a triple-semi crash and a father-son team race to clear the road as weather blasts in.

A courier truck rolls over; a vicious storm puts Mark in the middle of a crash zone; the crew dive for cover during an icy airbag job.

James and Bubba recover a semi smashed into a building; Kevin faces problems with a tractor-trailer crashed in deep mud.

Gary's team battle to upright a crippled trailer; a rookie takes his first shot as lead operator on the rotator.

With Gary away, Kyle must step up fast as he battles a wreck that will prove if he can really lead a team on his own; Sonny heads to the scene of a violent jackknife.