In England a great many ash trees (g. Fraxinus) have contracted a terminal disease. These are being felled but there is now no market for this timber. Landowners put it to good use, such as in my picture, using it to prevent road vehicles leaving the road to park, camp over night, illegally deposit refuse and other anti-social activities.
This one always makes me smile - from a distance it looks like a very large cartoon caterpillar.
Whiteways roundabout, near Arundel, West Sussex. Beside the A284 road heading north.