At the front end, the linesman’s flagpole plays a vital role in this innovation. It provides real-time help to the assistant referees by signalling the most important events: the ball passing through the goal and sidelines, and above all, the offside situations. The pole vibrates, beeps, and flashes its coloured LED lights. They tell instantly which line the ball has crossed. When offside is detected, its display shows the computer-generated offside graphic, automatically created when the ball was kicked.