The way I spot LA drivers is their masterful use of the 'fake'. They use their signal, then just look like they are going to pull into the spot in the lane way to small for their car. The driver behind panics, and slams on the brakes as the other driver completes the fake by swerving back into their lane. By that time the car behind is far enough back so the car just merges in with no problem.

I almost hurt myself I was laughing so hard the first time I saw that.