Ulaanbaatar in context: Street-network sprawl trends

Ulaanbaatar in context

3.94.24.54.8<19751976–19901991–20052006–2020SNDi of street additions
3.94.24.54.8<19751976–19901991–20052006–2020SNDi of entire street network
UlaanbaatarMongolia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ulaanbaatar plotted against Mongolia. The SNDi of new construction in Ulaanbaatar peaked in 1976-1990, while Mongolia rose steadily. Most recently, Ulaanbaatar's incremental SNDi fell from 4.76 to 4.72 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ulaanbaatar ranked 2nd out of 2 in Mongolia as of 2020.

New Street Additions (2006–2020)

SNDi value
4.72
Rank in Mongolia
2nd of 2

Entire Network (Aggregate)

SNDi value
4.51
Rank in Mongolia
2nd of 2

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
UlaanbaatarTurinBrisbane

In new street additions, Ulaanbaatar and Turin both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Brisbane built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full street network, though, all three cities follow the same trend.