The urban area extends faster than the activities and population concentrate on the area owing to the technological progress in communication ; Tokyo metropolitan region is estimated to cover the area with a radius of 400 km. This tendency has recently been so accelerated that Tokyo's frontier is streching to cover the whole country. 45 000 persons, including 1 600 persons in Fukuoka on the west and 1 900 persons in Yamagata and Iwate on the east, are commuting a long distance trip to Tokyo on the 1985 census basis.
