The NFL’s magic yellow line, explained

The clever engineering behind the virtual first-down line. Subscribe to our channel! --- Since the late 1990s, the virtual yellow line has been quietly enhancing football broadcasts by giving viewers a live, intuitive guide to the state of play. The graphic is engineered to appear painted on the field, rather than simply plopped on top of the players, so it doesn’t distract from the game at all. The line debuted during a September 27, 1998, game between the Baltimore Ravens and the C