We built a mini twin tower bridge with a combination of suspension bridge and lift bridge (the span of the bridge can be raised for large ships to pass through). The bridge is 70 inches long, with two spiers 31 inches high. The 11-inch-long middle span is located between the two towers, separated by two mini-motors, which can be raised to an 80-degree angle for ships to pass. The spans on either side are two suspension bridges, each 23 inches long with slings hooked to the pillars on either side and threaded through the ropes connected to the walkway above. Thank you for watching our videos, don’t forget to subscribe to our channel to see the latest videos.