There's pending legislation before our California Senators which proposes a 3' space between cars and cyclists.
"State Assembly is expected to vote Friday on a bill that would require all drivers to give bicyclists at least 3 feet of space when they pass them.
The bill, SB 1464 ,would also require drivers to slow to a “reasonable and prudent” passing speed when the distance is not possible. It also permits drivers to, when safe, move into the oncoming traffic lane to provide the required space. Anyone who violates the proposed law would get hit with a $35 fine; and if a cyclist is injured due to a violation, the fine goes up to $220.