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Laira Bridge is a disused railway bridge that crosses the River Plym in the city of Plymouth. The bridge was refurbished to carry a pedestrian and cycle path, which opened in 2015.
The name is also used to refer to the road bridge that runs alongside and carries the A379 road.
Wikipedia: Link

Laira was originally the name given to that part of the estuary of the River Plym from the Cattewater up to Marsh Mills in Plymouth. The name may derive from a Brythonic word corresponding to the Welsh llaeru, meaning 'to ebb'.