Ginza's Chuo-dori goes pedestrian-only at 12:00 on Saturdays, Sundays and holidays - until 18:00 April to September, 17:00 in winter. Before noon it is a normal road.
Tokyo Tower's Top Deck is not the Main Deck 100m higher — it is a timed, guided tour on a separate ticket. What the extra height and the extra fee actually buy.