In this episode we reveal disasters caused by drivers drifting across the carriageway, from the worker who crashed a tanker full of fuel into a group of parked cars in Thailand to the driver in Norway who veered directly into the path of an oncoming HGV.We witness the dangers of the hard shoulder, including a rescue worker in Texas who came face to face with a flying SUV, and a motorist who ended up rear-ending a roadworks vehicle in San Diego, California.We also see what happens when exiting the motorway goes wrong, like the car that got shunted up the motorway in Staffordshire after pulling in front of a huge lorry, and the motorist in Malta who got their exit strategy all wrong and flipped upside down onto their roof.Plus, we reveal why it pays to expect the unexpected, and what can happen when animals stray onto the highway.