An acquaintance of mine argues that CVC 22400 [ http://dmv.ca.gov/pubs/vctop/d11/vc22400.htm ] the "Minimum Speed Law", in its section (a), prohibits bicycles from highways, and thus proves that they don't belong there.
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.
I suppose you could argue that speeds of 5-25 MPH are necessary for the safe operation of a bicycle. On the other hand, it doesn't appear that CVC 21200 nor 21202 have sections that specifically contradict or invalidate 22400.
So where is the legal exemption to 22400 that allows bicycles operating at speeds that may "impede or block the normal and reasonable movement of traffic"?