Dang. That looks Suicidal
It’s less suicidal than trying to make a left turn on a busy highway. I generally turn right then make a u turn at first opportunity. It takes less time than waiting for traffic to be clear from both directions for a left turn.
Something that traffic planners probably didn’t think about when designing a ‘J’ turn is the increasing numbers of cars that have the ‘stop/start’ technology. If one is driving a newer car with this ‘feature’ and you are waiting to J-turn into traffic that is moving at a high rate of speed, the last thing you need is for your car to pause while it spools up the engine.
It would seem that ‘J’ turns are an idea just waiting for class-action lawsuits against the auto makers who built the car, the local governments who install J-turns, and possible the Federal DOT for mandating the ‘stop/start’ crapola.