California: Riding against traffic on a one-way street
In the case of a one way street, the implication is that you "may" ride (not must ride) close to the left hand curb. If you are traveling in the direction of traffic, this allows you to complete a left hand turn in a safe and sane manner.

The provision in California Vehicle Code Section 21200(a), listed below, makes clear that a bicycle on the street is subject to all the same laws as a motor vehicle, the only exception being where those laws can't be applied due to the nature of a bicycle. (For example, emissions standards). That would indicate to me that the expectation is that a bicycle ride in the direction of permitted traffic, when on a one way street.


21200: (a) A person riding a bicycle or operating a pedicab upon a
highway has all the rights and is subject to all the provisions
applicable to the driver of a vehicle by this division, including,
but not limited to, provisions concerning driving under the influence
of alcoholic beverages or drugs, and by Division 10 (commencing with
Section 20000), Section 27400, Division 16.7 (commencing with
Section 39000), Division 17 (commencing with Section 40000.1), and
Division 18 (commencing with Section 42000), except those provisions
which by their very nature can have no application.