Better than nothing? I’m not sure. Some California cyclist are calling this a win but is it really. Here’s an exception to the rule that Governor Brown demanded be in the bill before he signed it into law.
If the driver of a motor vehicle is unable to [pass more than three feet away from the cyclist] due to traffic or roadway conditions, the driver shall slow to a speed that is reasonable and prudent, and may pass only when doing so would not endanger the safety of the operator of the bicycle, taking into account the size and speed of the motor vehicle and bicycle, traffic conditions, weather, visibility, and surface and width of the highway.
So give the cyclist three feet unless it would be a hinderance to you, then just give him as little room as you feel is safe for him.