Bridge four-lane highway on the upper level and a pair of railway tracks at the lower level. Tower Bridge in London is different example of a double-decked bridge, with the central section consisting of a low level bascule span and a high level footbridge. A viaduct is made up of multiple bridges connected into one longer structure. The longest and some of the highest bridges are viaducts, such as the Lake Pontchartrain Causeway and Millau Viaduct. A three-way bridge has three separate spans which meet near the center of the bridge. The bridge appears as a "T" or "Y" when viewed
Abrisham Bridge a tilted pylon on its north side. Regarding its tilted tower, it was the first of its kind in Tehran. The footpath is supported by 20 cables composed of 12 wires, asymmetrically distributed on the two sides. The length of the longest cable is about 53 meters, and the shortest is about 20 meters; the height of the pylon is about 40 meters; the greatest span of the bridge is about 132.85 meters; and the width of the whole bridge is about 10.5 meters. Abrisham Bridge Abrisham Bridge (, "Pol-e Abrišam"), literally the "Silk Bridge", is a cable-stayed bridge in