While not a Californian, I believe the laws there allow for bikers to do just what B12 was commenting on, they can ride down the middle of the lanes. Call it a speed lane only avaible for bikers, a bit of a benefit for those of us who have no air conditioners, no protection from the heat and elements. I personally don't condone wild or irresposible riding, but understand the reasoning for the laws there.
Stay safe out there, it's all of our responsibility!