M5 split levels: 50 years of 'iconic' Somerset viaduct
The split-level viaduct built to carry the M5 motorway through a Somerset hillside has reached its 50th anniversary.
The section, known as Wynhol Viaduct, linked the motorway network between Clevedon and Portishead and opened in 1973.
The viaduct was unusual as it was built into the landscape of the Clevedon Hills.
The BBC tracked down one of the workers who was involved in the building work.
Video Journalist: Dan Ayers