The level of street-network sprawl in new development in Tochigi peaked in 1976-1990. To get a sense of how street development has changed in Tochigi, we can consider three of its most populous cities: Utsunomiya, Oyama and Sano. Out of the three cities, Oyama does not follow the same trend as the region. The level of street-network sprawl in new development in Oyama followed a zig-zag trend with an overall increase.

How do development practices in Tochigi fare in comparison to others in Japan? Most recently in 2006-2020, street construction in Tochigi was the 6th-most disconnected out of the 44 regions in Japan. Its position in the ranks since 1975 has risen; relative to other regions in Japan, street construction in Tochigi has become more disconnected. Tochigi ranked 12th in 1975, 9th in 1976-1990, 10th in 1991-2005 and 6th in 2006-2020.

As of 2020, the city with the most disconnected street network in Tochigi is Utsunomiya with an SNDi of 2.44, which is relatively well-connected. Conversely, the most connected city is Oyama with an SNDi of 1.69, which is very well-connected. See trends for these cities: Oyama, Utsunomiya

The level of street-network sprawl in the aggregate network in Tochigi rose steadily. To get a sense of how the aggregate street network has changed in Tochigi, we can consider three of its most populous cities: Utsunomiya, Oyama and Sano. Disconnectivity in the most populous cities in Tochigi follow the same region trend.

To date, Tochigi is the 11th-most disconnected out of the 44 regions in Japan. Its position in the ranks since 1975 has risen; relative to other regions in Japan, the street network in Tochigi has become more disconnected. Tochigi ranked 12th in 1975, 10th in 1976-1990, 11th in 1991-2005 and 11th in 2006-2020.