It's a warning to cyclists who may be using the 90% of cycle lanes that are on the nearside. Doing nothing wrong, in other words.
True. Although some cycle lanes are really crap and, although following them is the suggested thing, isn't always the sensible thing.
Here for instance there is a constant stream of cyclists going straight on whilst cars attempt to turn left.
https://goo.gl/maps/C6pnfiux4ct
@spindrift started
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It's a warning to cyclists who may be using the 90% of cycle lanes that are on the nearside. Doing nothing wrong, in other words.