In areas where there isn’t a dedicated U-turn lane, you have to use the left-turn lane if you want to make a U-turn. You just have to work with what’s available since not all roads are wide enough to have a separate U-turn lane.
I used to complain about drivers in front of me making U-turns and causing me to miss the light. In some cases, it can even lead to rear-end collisions. But then I found myself doing the exact same thing…
So what’s the proper etiquette here? What do you all do? Wave? Honk? (Probably not a great idea where I live since everyone honks anyway.)
In California, a U turn is considered a left turn that keeps going. As a result, a U turn is legal anywhere that a left turn is legal, except when signs are posted otherwise. So in a left-turn pocket/lane, it is both reasonable and expected that people will make left turns, some of which will continue into a full 180 degree turn. People who do U turns are doing what is allowed, and they have every right to do so. If this seems like a problem, then talk to your transportation department to restrict U turns.
I’m not aware of any aspect of a U turn procedure that would be any different than than a standard 90 degree turn: use turn signals, look for oncoming traffic, look for pedestrians, turn slowly as required by the radius, roll out of the turn with careful acceleration.