Topplay Yard Lines
Yard lines, at intervals of 5 yards, run parallel to the goal lines and are marked across the field from sideline to sideline. These lines stop 8 inches short of the 6-foot solid border in the NFL.
Yard lines give players and fans an idea of how far a team must advance the ball in order to record a first down. As Chapter 3 explains in detail, an offen-sive team must gain 10 yards in order to post a first down. Consequently, the field is numbered every 10 yards, starting from the goal lines. All these lines and numbers are white.