World's Most Dangerous Roads

And you thought the M25 was bad. Sue Perkins and Charley Boorman trek across Alaska on the notorious Dalton Highway, battling Arctic conditions on a glorified dirt track.

Comedians Rhod Gilbert and Greg Davies won't be laughing too much as they dodge reckless drivers, floods and landslides on an ambitious drive through mountainous Nepal.

Celebs Ben Fogle and Hugh Dennis face risky hairpin bends and terrifying 2,000ft drops as they wind their way through the Peruvian Andes in search of a fabled lost city.