This is a small bison tube on the Litle metal bridge that spans a drainage ditch as it is a public footpath this give access to the adjoining path.
The bridge is feeling a little sorry for intself and used to have a gate attached as the footpath went into fields with horses.
Land around here was purchased fkr housing many years ago so all land is over grown and wild however the paths still open to public and still cleared.
No need to get in ditch!