full traffic light gives a sign valid for driving in all directions traffic light with an arrow only for driving in the direction of the arrow a traffic light that has a green arrow (ie not a round light with a drawn arrow) also gives information that driving other vehicles in the collision direction has "stop" on the other hand, if you give a "free" traffic light with a round light with only the drawn arrow, you still have to give priority to oncoming vehicles when turning left, even if you still have additional arrows to turn and complete the turn, but I will not complicate it