The goal lines are the lines the ball must cross while being either passed or ran in order to score a touchdown. The interior edge of the goal line (relative to the center of the field of play) should lie at the 0 yard line, and the center of the 1 yard line should be exactly 1 yard from this edge of the goal line
football_goal_line(field_width = 0, feature_thickness = 0)
A data frame of the bounding box of the goal line
The width of the field
The thickness of the goal line