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22400. (a) No person shall drive upon a highway at such a slow
speed as to impede or block the normal and reasonable movement of
traffic, unless the reduced speed is necessary for safe
operation, because of a grade, or in compliance with law.
Notice the "because of a grade" and "or in compliance with law"... now take your law of bicycle riding which states it is legally required that you ride on the road and you find that it is legal for a bicycle to impede or block the normal flow of traffic in some circumstances.