Blinkage

[Ghoulish Delight]

Originally Posted by Alex

Not that anybody really follows the rules but you shouldn't be passing on the right.

Myth.

Originally Posted by California Vehicle Code 21754

The driver of a motor vehicle may overtake and pass to the right of another vehicle only under the following conditions:
(a) When the vehicle overtaken is making or about to make a left turn.
(b) Upon a highway within a business or residence district with unobstructed pavement of sufficient width for two or more lines of moving vehicles in the direction of travel.
(c) Upon any highway outside of a business or residence district with unobstructed pavement of sufficient width and clearly marked for two or more lines of moving traffic in the direction of travel.
(d) Upon a one-way street.
(e) Upon a highway divided into two roadways where traffic is restricted to one direction upon each of such roadways.
The provisions of this section shall not relieve the driver of a slow moving vehicle from the duty to drive as closely as practicable to the right hand edge of the roadway.

From that, about the only situations you AREN'T allowed to pass a vehicle on the right are when you're on a 1-lane per direction road and when it's physically impossible.