The level of street-network sprawl in new development in Tandjilé peaked in 1991-2005. To get a sense of how street development has changed in Tandjilé, we can consider two of its most populous cities: Kelo and Laï. Out of the two cities, Kelo does not follow the same trend as the region. The level of street-network sprawl in new development in Kelo followed a zig-zag trend with an overall increase.

How do development practices in Tandjilé fare in comparison to others in Chad? Most recently in 2006-2020, street construction in Tandjilé was the 2nd-most disconnected out of the 19 regions in Chad. Its position in the ranks since 1975 has risen; relative to other regions in Chad, street construction in Tandjilé has become more disconnected. Tandjilé ranked 5th in 1975, 12th in 1976-1990, 13th in 1991-2005 and 2nd in 2006-2020.

As of 2020, the city with the most disconnected street network in Tandjilé is Laï with an SNDi of 1.59, which is very well-connected. Conversely, the most connected city is Kelo with an SNDi of 1.17, which is very well-connected. See trends for these cities: Kelo, Laï

The level of street-network sprawl in the aggregate network in Tandjilé peaked in 1991-2005. To get a sense of how the aggregate street network has changed in Tandjilé, we can consider two of its most populous cities: Kelo and Laï. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Kelo rose steadily. The level of street-network sprawl in the aggregate network in Laï followed a zig-zag trend with an overall increase.

To date, Tandjilé is the 10th-most disconnected out of the 19 regions in Chad. Its position in the ranks since 1975 has fallen; relative to other regions in Chad, the street network in Tandjilé has become more connected. Tandjilé ranked 5th in 1975, 10th in 1976-1990, 11th in 1991-2005 and 10th in 2006-2020.