That headline might be a little cryptic, but maybe you’re from out-of-town or something and you might benefit from the illustration below - it’s clear enough. The driver of this purple Toyota 4Runner truck just missed the chance to turn left legally because he didn’t commit to making the turn. The way to do that is to simply enter the intersection when the light turns green and then wait your turn to go left.
Maybe you’ll have to wait until the yellow or red light comes on, but that’s O.K. What you shouldn’t do is creep forward a couple of feet into the crosswalk and then sit there until the red and then wait for the light to cycle green again. Bad form. You’ll just be parked there all day that way. I cry foul.
You think you’re being safe, but you’re not. Intruding past the stop line before the green light and then into the crosswalk after the green light is also improper.
Just enter the intersection and you’ll be fine.
¡Bienvenido a San Francisco!