Really pleased that our local authority is finally treating unicycling with the respect it deserves, with the introduction of the first purpose made unicycle on-street parking bay.
A single yellow line forbids parking at certain times of day. (2 parallel yellow lines indicate no parking ever.)
Here, the single yellow line has been painted onto a rotating street insert. A unicyclist is then able to rotate the insert until the single line is broken, and there is just enough space to park a unicycle, but no other vehicle.
Strictly, it’s a breach of the rules to overhang the yellow line with a conventional vehicle, even if your wheels are on unpainted road, so if the traffic wardens adopt a similar approach, the bay will be out of bounds for anything bigger than a 29, but it’s a start.