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Comedian Sue Perkins and adventurer Charley Boorman travel across Alaska to the notorious Dalton Highway, where avalanche units operate throughout the year.
Comedians Rhod Gilbert and Greg Davies attempt to drive through the mountainous, landlocked nation of Nepal, starting from the chaotic border with India.
Celebrities board 4x4 vehicles to tackle some of the world's most infamous roads in tough regions such as Alaska, Nepal and Peru.