A1: Britain's Longest Road Season 4: Episode Guide & Ratings

A driver’s life hangs in the balance after a serious accident in one of the worst snow storms to hit the A1 in decades. A passenger panics after being stranded on an icy embankment. And a huddle of penguins is in a flap on their motorway move.

Police box clever during a pursuit of a suspected stolen car. A driver faces a five-hour wait after breaking down in freezing conditions. And a convoy of million-pound motors makes a difficult detour off the A1.

Emergency teams battle to quell a devastating van fire which refuses to die down. An overturned lorry forces the closure of the road to Edinburgh and police cry foul after a giant football veers on to the Great North Road.

The innocent party in a three-car crash ends up on the wrong side of the law. A huge operation is launched to move a 300-tonne load up the A1. And police rescue two motorists caught short of fuel.

Police face a tough task to free a fragile driver. A1 traffic cops seize a car being driven with no insurance and no licence. And a major crash forces the closure of the road for nearly six hours.

Police rush to the rescue after a caravan overturns on the A1. Traffic officers hurry to deal with two vehicles abandoned in dangerous spots. And a six-metre giant makes an epic journey up the Great North Road.

An emergency callout to rescue a driver trapped in his car. A1 traffic officers help a motorist stranded in freezing conditions. And a driver is left red-faced after being caught red-handed using her mobile phone.

A tragic accident leaves a biker fighting for his life. Traffic officers track down pedestrians taking a dangerous path alongside the carriageway. And a two car crash sparks fears a driver has worrying injuries.

An accident on an icy road forces traffic officers to take drastic action. A1 traffic cops investigate the cause of a two-car crash on a roundabout. And a mobile phone using motorist gets the blues and twos.

Police are alerted to an emergency after a car collides with a huge 36-ton crane. A1 traffic cops battle to clear two dangerous vehicle breakdowns. And a near 40-foot metal giant turns heads on its journey up the Great North Road.