S1, E3: Because closure is not an option on Canada's busiest highways, it's up to the heavy rescue teams to keep them open through the worst of the winter driving season. This series, based on Discovery's hit "Highway to Hell," rides along with crews from multiple major tow operators, rescue, and maintenance crews day and night who keep Ontario's 400-series highways operating at any cost. From Sarnia eastbound to Toronto and north to Barrie, the cast of heroes work diligently to safeguard the country's most important trade route with the U.S. from grinding to a crippling halt through any weather condition.