I only use them if there is a car behind me, waiting in the street that I'm turning onto, and if there is a car that is somewhat close in the lane that I am switching to. Never saw a reason to use them if there weren't any cars around. I also don't follow the no turn on red signs or no left/right turn signs. If the road is busy, I'll find another route. If there isn't a car around, I'm gonna do it.