National Cycleways Network Milepost. Letchworth 8 miles.  Welwyn Garden City 10 miles.  There are 4 designs of these mileposts on the NCN.
<a rel="nofollow" class="external text" href="https://www.geograph.org.uk/profile/764">Robin Hall</a>
CC BY-SA 2.0
From <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/photo/107109">geograph.org.uk</a>