Freezing rain scatters Gary's team, forcing him to work solo to open the continent's busiest border crossing; in Windsor, Brad, Eric and crew fear a tragedy when they untangle a sedan badly crushed by a semi.

The pressure is on for Steve when a flipped truck blocks access to the airport; Coxon fights a wreck with a toxic payload; a wild rollover rips a cab off its chassis and leaves a trail of destruction for the Ross crew.