A new BBC2 documentary - The Motorway: Life in the Fast Lane - is shining a light on the hidden world of the M6, including its most famous structure, Spaghetti Junction. "It's like a cathedral," says Steve Wood, staring up at the interweaving arches of Spaghetti Junction's dark grey concrete above. There are no stained glass windows, and no steeple - just 13,000 tonnes of steel reinforcement and 134,000m~3 of concrete. But for Steve, who has worked on the Gravelly Hill Interchange for the past eight years, the pillars, supports and asphalt around him are as beautiful and interesting as any Renaissance fresco.
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