Highway Thru Hell - Season 4 (2015)

Al and Gord battle through a stormy night to keep the Coquihalla Highway open for Christmas. A semi plows off a bridge, stranding holiday travelers, and a remote logging road job forces Ken to relive his close call from last year.

Al Quiring is in a high-pressure race to open the TransCanada Highway before rush hour. Jordie from Mission Towing faces a semi ready to split in two. Jamie Davis is running a race too when a pharmaceutical truck plunges down a bank.

Freezing rain covers Hope in a thick layer of ice, crippling Jamie's operations. A good friend of Jamie's is called into action when two semis collide head on, leaving wreckage scattered across the TransCanada Highway and a major rail line.

Al and Gord work to rescue a loaded semi that's teetering on the edge of a 300-foot drop. Colin faces a white-knuckle drive on a remote Alberta back road, and Jamie tests out a new driver, who might be in over his head.

Jamie and Jason Davis' crews team up for a massive wreck. A close call forces Brandon to reconsider his future. Robert faces down a speeding semi on an icy road. In Alberta, a jackknifed truck gets twisted in unexpected directions.

Strategies collide when the Davis and Quiring families team up for a recovery on the busiest highway in B.C.. On the Coq, a big rig is left teetering in an impossible position. Mission Towing gets an urgent call while on of a big recovery.

A simple job turns into a puzzle when a flipped semi pulls Jamie back out on the road. Randy Jacknife faces off against an overturned truck trapped under its load of steel. Matia "borrows" Uncle Jamie's Boss Truck for an off-road adventure.

Al and Gord gamble on a big job that has the highway closed and both green wreckers pushed to the limits. A Mission wrecker is called to solve an underwater mystery. Jamie's crew battles a whiteout to reach a massive chain reaction wreck.

The cast and crew look back at their accomplishments and how the show changed over the history of the show.

Jamie returns to the Rotator for the first time in months but he might be too rusty to avoid disaster. An unexpected tragedy strikes Mission Towing. Jamie turns to his competition for advice that may determine the future of Heavy Rescue.