Rookie Sonny faces a 40-car pile-up that turns a major highway into a war zone; in the snow belt, a fierce storm triggers a triple-semi crash; the father-son team at Preferred Towing race to clear the road as weather blasts in.

A semi-truck crash shuts down a crucial border route, putting pressure on lead operator Kevin to reopen the road; rookie heavy rescue driver Sonny helps a trucker stuck on a dangerous stretch of highway; a tanker wreck causes commuter chaos in Toronto.

A courier truck rolls over; Mark finds himself in the middle of a crash zone on the 401 during a storm; and the crew are faced with an icy airbag job.

James and Bubba recover a semi that smashed into a building without bringing down the whole structure; Kevin faces problems with a tractor-trailer that has crashed in deep mud.

Gary's team fights to upright a battered trailer that is dangerously close to splitting open; a rookie takes his first shot as lead operator on the rotator under tough conditions.

Gary's second-in-command Kyle tangles with a wreck that will prove if he's got what it takes to lead the team; Sonny heads to the scene of a violent jackknife where curious drivers are causing further problems.

A whiteout pile-up scatters heavy I-beams across the highway, testing James and his crew; Kevin must lift a 20,000-pound chunk of steel off the road. Herb's crew stares down a huge mess and a marathon recovery in tough condition.

During a spring store, Steve cleans up a fuel spill blocking the 400, while Sonny struggles to keep the alternate route moving; John Allen recovers a loaded semi that went for a wild airborne ride.

Members of the "Highway Thru Hell" crew join the 401 crew to weigh in on the unique challenges of recovery operations in Ontario and B.C.. comparing the biggest wrecks and toughest jobs over the past winter.