Originally Posted by
SoSmellyAir
Neither of the cited posts cover a fairly common reaction by non-cyclists and inexperience cyclists around these parts: interpreting "on your left" as a command to shift to their left, which leads to a close call.
Perhaps Californians are easily confused. Never had that happen in Wyoming or Colorado in riding several thousand miles on MUPs. But my average speed is usually around 10-12 mph and I am always prepared to brake when passing.