The viaduct is 500m long and carries the M40 over the Loudwater Valley. It was constructed in 1968 and UK Highways has a 30 year PFI concession for the M40 motorway. A recent survey identified a problem with reinforcement corrosion in the cross head beams.
![](https://cpa.associationhouse.org.uk/agm_v2//public_html/uploads/case_study_images/1456333009_43026.jpg)
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