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A deadly tragedy on a motorway in Oklahoma sends one of the state's busiest bridges collapsing into the Arkansas River below; expert engineers investigate how a tugboat striking a reinforced concrete pier could cause such a catastrophic disaster.

Highlights of all the action from the British Superbike Championships.

Ant is in Essex to see a car that was fit for the Queen, a 1970 Rover P5B. The V8 wins him over, but rust, oil leaks and heavy steering spell trouble.

Chris and Francis face huge setbacks with the wheels of their locomotive. The time and cost implications could be disastrous for the restoration.

Francis and Chris dig deep to help save their loco restoration when crisis hits. Will their high-risk strategy destroy their dream?

Mike is in San Francisco looking for a classic Chevrolet Step Side Pick Up. Will he manage to find a rust free model for Edd to restore?

After purchasing a badly modified DeSoto Firedome Mike and Edd set about addressing the damage to give this stunning cruiser back some class.

Mike bags an American classic, a Chevrolet Corvette Stingray, but it's only been partially restored. Can Edd work his magic and make it seem as good as new?

Mike is excited to pick up one of his favourite types of convertible: the 2000 Porsche 996. With only a few issues, this car will be an absolute steal for him.

Henry and Fuzz visit Colin in Hertfordshire to revive his faded MG MGA, a once-glorious 1950s sports car that's been silent for years.

Henry and Fuzz head to Bristol to help Russell revive his 1947 Standard 14: a post-war classic with charm, history, and plenty of hidden troubles.

Presenter Henry Cole and motorcycle restorer Sam Lovegrove are in the Cotswolds to visit the largest sidecar manufacturer in Britain. They uncover a rusty Lancia Aurelia and a Royal Enfield 500.

Bike guru Henry Cole and ace mechanic Sam Lovegrove reminisce on their Best Bits from the last two series of 'Shed & Buried'. This time round, the two look back at their visit to Peter Bullen, a trials car enthusiast.

Henry and Sam remember Brian, whose Cornish cottage was like a transport museum chock-full of memorabilia, penny farthings and trinkets of all descriptions.

Bike guru Henry Cole and ace-mechanic Sam "The Engine Whisperer" Lovegrove remember their visit to Eamon's place in Oxfordshire, where they were searching for vintage treasure to restore.

Vinnie gives the Rag 'n' Bone man a tour of his countryside empire where the pair discuss the highs and lows of life in the limelight and dealing with fame. There's an urgent aerator problem at the lakes and Vinnie risks losing £20k's worth of trout.

Ant is in Essex to see a car that was fit for the Queen, a 1970 Rover P5B. The V8 wins him over, but rust, oil leaks and heavy steering spell trouble.

Fine art conservator Lucia Scalisi finds herself in the middle of an unusual mystery when she sets about restoring a painting by celebrated artist CJ Frost, and Steve Fletcher and David Burville team up to repair a 130-year-old automaton tiger.

Metalworker Dominic Chinea welcomes 93-year-old Dora Paul to the workshop, along with the unusual item she has brought in for repair: an old tram seat which once ferried passengers on the number 81 tram in Salford, Greater Manchester.