At traffic-light intersections without a left-turn arrow, the proper procedure for people intending to turn left is to yield to those going straight and those turning right from the other direction.

In Pittsburgh, this is still technically the law (as far as I know - I'm new here), but there seems to be a universal exception: the first car intending to turn left will always jump the gun and go as soon as the light turns green, regardless of whether there's opposing traffic going straight or right. The first car in the opposing lane is expected to wait for one car to make the Pittsburgh Left before going, to the point where they'll honk or scream at me if I don't let them.

Overall

Nobody can drive in Pennsylvania.