Without further information, I have no reason to think that the scenario you described is illegal. In fact, I've seen any number of motorists, motorcyclists, and cyclists do exactly that.
Incidentally, the whole notion of cyclists being subject to the same laws as cars is rather ridiculous. Bicycles are not cars, just as cars are not "road train" semis.
Yes, Oregon's U-turn law is a constant source of annoyance in the pacific northwest. Meanwhile, if U-turns were made illegal in California, navigating the bay area would have a twilight zone quality to it.
>Incidentally, the whole notion of cyclists being subject to the same laws as cars is rather ridiculous.
That may very well be how you feel; but, according to California vehicle code, bicycles and automobiles are bound by pretty much the same traffic laws, with few differences --such as a few sidewalk exceptions, having to keep right, etc.
Incidentally, the whole notion of cyclists being subject to the same laws as cars is rather ridiculous. Bicycles are not cars, just as cars are not "road train" semis.