Rolle canal.

A roving bridge adjacent to the Tarka trail.
This bridge was designed as a special canal feature to enable the horses to cross the canal from one tow path to another without the tow rope having to be unhitched. This is likely to be the only such bridge in Devon.
In this case the tow path shown in the picture continues on and follows a precarious route along the edge of a steep rock face, dropping down to the River Torridge. On the far side of the bridge the tow path runs along the other bank of the canal.
The very narrow channel of the original canal can be seen passing under the bridge, but is now largely dry and rather overgrown.