When the stadium opened for the 1955 season, Carpenter's first, advertising billboards first appeared on the walls and roofs of the outfield: Foremost dairy, Goldenberg's Peanut Chews, Philco, Cadillac, Alpo, Coca-Cola and Mertz Tours signs became familiar sights to stadiumgoers and to fans watching on television. A new straight-across fence covered the square corner in center field and most of the remaining "terrace", reducing the distance to a still-formidable . Distance markers also appeared on the walls for the first time. In addition to the foul poles (334 and 331) and the center field area (447), a 400 marker was posted just to the center field side of the scoreboard, and a 405 marker in the corresponding area of deep left center field. A few years later, wooden fencing covered the rough bricks along the right field wall, and eventually the 331 sign was changed to read 329, although that change had no impact on the actual home run distance.