The level of street-network sprawl in new development in Illinois peaked in 1991-2005. To get a sense of how street development has changed in Illinois, we can consider three of its most populous cities: Chicago, Aurora and Bolingbrook. Out of the three cities, Chicago and Aurora do not follow the same trend as the region. The level of street-network sprawl in new development in Chicago rose steadily. The level of street-network sprawl in new development in Aurora peaked in 1976-1990.

As of 2020, the city with the most disconnected street network in Illinois is Bolingbrook with an SNDi of 3.73, which is relatively sprawly. Conversely, the most connected city is Champaign with an SNDi of 1.86, which is very well-connected. See trends for these cities: Champaign, Bolingbrook

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