The total length of the designed roads is 71 km. They are built on the pillars, or are laid below the ground level directly through residential areas or along the rivers in Tokyo. metro lines, but their length for the city of 10 million. Residents are very small. The first line is 14.3 km long built in 1927., The second is 16.6 km in 1957. Three more lines are designed now. After laying them, the total length of the metro lines should reach 109 km. The construction of a monorail road is also planned; Two small experimental sites have already been built.