The guide wheel of a First Group guided bus at the Long Ashton Park &amp; Ride terminus of the Metrobus m2 route in Bristol, UK
Chris Wood (<a href="//commons.wikimedia.org/wiki/User:Chris_j_wood" title="User:Chris j wood">User:Chris j wood</a>)
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>