This scene models the aeroelastic sway of a long-span suspension bridge, the same class of structure as the Golden Gate or Akashi Kaikyo bridge. The parabolic main cables hang between two towers under their own tension, transferring load down through vertical hanger cables to the roadway deck below. Under sustained crosswind loading, real suspension decks can twist and oscillate laterally and vertically at low frequencies, a phenomenon engineers call wind-induced sway or, in extreme resonant cases, aeroelastic flutter (as famously seen at Tacoma Narrows in 1940). Here the deck segments, hangers, and cables all sway together in a synchronized sine-wave pattern to visualize that coupled motion, while small cars stream across the deck in both directions as traffic. Use the controls to dial wind strength and sway frequency up or down and watch how the whole structure's rhythm changes.