As far as I can tell that would be legal, just impossible. The ball is 40 inches in diameter, the space between the bars on the Overpass is only ~30 inches. You might or might not be able to get the 8 points from doing this. If you can manage such a feat I will be very impressed. If you come up with a way to do that without destroying the ball let me know, I would love to be part of patenting such an invention. If you mean are you allowed to shoot the ball over the overpass, I haven't seen anything saying that you cannot.