Create an underground tunnel, the longest in JapanTen-year-long history. To connect the ring road around Tokyo.Do not traffic in city traffic,In addition, to accommodate the growth of cities and the expansion of the business.
Build an underground tunnel, the longest in Japan , which created a dozen years to connect the ring road around Tokyo made no traffic jams in the city, also to support the growth of cities and the expansion of the business.
Build underground tunnels, the longest in Japan on the keypad) which made for more than ten years
. In order to connect the Beltway around Tokyo make traffic congestion in the city also to support the growth of the city and the expansion of the business.