Much debate about goal-line-technology and what system football should turn to. Choice seems to be between the Hawkeye system similar to that used at Wimbledon or the GoalRef technology that sees a microchip inside the ball.
The present problem seems to be that the action happens so quick that the human eye of the referee cannot see with 100% accuracy whether the ball has crossed the line or not. We have seen many examples of the referee deciding he saw one thing only for them to be proved wrong later when the boys in the studio look at it from every angle.
Personally, i enjoy the human error part of it, my team have scored goals that should never have been as i have seen goals scored against us which should never have counted and my worry is that it will quickly creep from the game being paused while the referee looks at whether the ball crossed the goal-line to whether it was a penalty or a red card and we will be stopping and starting all game long.
Now, as a few people have pointed out but have been ignored, the large majority of these incidents seem to occur when the ball comes down off the crossbar and the crossbar is round. Would a ball come down like that if it was bouncing off a flat surface, such as a square crossbar?
I'm no expert in geometry but wouldn't it be almost impossible for a football to hit the bottom of a square bar and come straight down as it does when hitting the underside of a round bar? It would just skim off and carry on or hit the edge and come out. If i'm wrong then how about a triangle with the point at the bottom so it has very little surface area that won't force the ball into the goal or away from it? Even a hexagon shape would work.
So instead of spending millions installing technology to tell us whether it was a goal or not and force games to stop and start, why not just go the low-tech and much cheaper option of just changing the shape of the crossbar?