The two bridges across the Nene at Irthlingborough

Today the A6 crosses the Nene, its meadows and backwaters, on a concrete viaduct. It must have been quite something when it opened in 1936.

Before then traffic had to negotiate a narrow medieval bridge. A Guide to the Industrial Heritage of Northamptonshire says

A 1920s attempt to widen the bridge and its approaches was abandoned half-way through when it was found that the entire bridge was on the move seawards!

It looks as though a recent strike by a vehicle has sent some of the stonework in that direction.