La señal circular junto al carril de la derecha (coloreado de rojo) indica que es obligatorio para conductores de ciclos circular por ese carril y que está prohibido usarlo a los demás usuarios de la vía (más detalles).
I think we are in front of a case of, as we call in Spanish, chapuza gorda.
As this was done, the sign should affect all the road, but is clear that that was not the intention of those who installed it. It affects only the “shoulder”. I place shoulder in quotes because this is not a shoulder, but a bike lane, so no driving, parking and etc… It’s only for bikes.
They were so kind, as many cycle lanes here are too, to paint or mix a different color into the bitumen to clarify the lane truly has a different function.
From having mapped many a road with fresh asphalt and lining, a solid_line really means a solid line… Do not go there in your 4 wheels! Only where allowed to cross lines they are briefly changed to dashed, at least here. Respected? Not in your dreams. The lesser bright and egocentric park on it and force the cyclist to perform a dangerous change over into where cars race by, hoping they’re not pre-occupied with their mobile. If I had a hammer… but that’s not allowed.