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Revised procedures for strengthening the M1 Tinsley Viaduct near Sheffield have been introduced since weld reinforcement work caused dangerous cracking in crucial areas of the box girder structure, the Highways Agency confirmed this week.

On Monday 25 November both northbound decks of the double deck 1km long 1960s viaduct, which carries both the M1 and the A631 across the lower Don Valley near Sheffield, were closed for emergency repairs. The viaduct was eventually re-opened the following Wednesday.

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