Originally Posted by supcom
Because there is a law that states, "Bicyclists must ride as far to the right as practicable." there is no such law pertaining to motor vehicles.
There are some specific laws relating to bicycles on the road that do not apply to motor vehicles. By the same token, there are some specific laws which apply to motor vehicles but not bicycles. But by and large, the rules of the road apply equally to both.
The entirety of the California Vehicle Code is available online at
http://www.dmv.ca.gov/pubs/vctop/vc/vc.htm. You can find out all the stuff involving bikes through the index at
http://www.dmv.ca.gov/pubs/vctop/vc/vc_index_b.htm, scroll down to "Bicycles".
The specific law in question about riding as far to the right as practicable is at
http://www.dmv.ca.gov/pubs/vctop/d11/vc21202.htm, it does allow for moving into the lane under some circumstances, including preparing to make a left turn, avoiding obstacles, etc. Note, too, that there's another section which is almost identically worded, but states that if a bicycle lane is present, you must use it (again, with exceptions for some circumstances).
Unfortunately no law stating that bicycles should get fined less than cars for rolling through stop signs
