The level of street-network sprawl in new development in Saga peaked in 1976-1990. To get a sense of how street development has changed in Saga, we can consider three of its most populous cities: Saga, Tosu and Karatsu. Out of the three cities, Tosu does not follow the same trend as the region. The level of street-network sprawl in new development in Tosu peaked in 1991-2005.

How do development practices in Saga fare in comparison to others in Japan? Most recently in 2006-2020, street construction in Saga was the 15th-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 Saga has become more disconnected. Saga ranked 27th in 1975, 19th in 1976-1990, 19th in 1991-2005 and 15th in 2006-2020.

As of 2020, the city with the most disconnected street network in Saga is Saga with an SNDi of 2.45, which is relatively well-connected. Conversely, the most connected city is Tosu with an SNDi of 1.93, which is very well-connected. See trends for these cities: Tosu, Saga

The level of street-network sprawl in the aggregate network in Saga peaked in 1991-2005. To get a sense of how the aggregate street network has changed in Saga, we can consider three of its most populous cities: Saga, Tosu and Karatsu. Out of the three cities, Karatsu does not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Karatsu rose steadily.

To date, Saga is the 25th-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 Saga has become more disconnected. Saga ranked 27th in 1975, 26th in 1976-1990, 26th in 1991-2005 and 25th in 2006-2020.