Bonab in context: Street-network sprawl trends

Bonab in context

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
BonabEast Azarbaijan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Bonab plotted against East Azarbaijan and Iran. The SNDi of new construction in Bonab peaked in 1991-2005, compared to East Azarbaijan which rose steadily and Iran which rose steadily. Most recently, Bonab's incremental SNDi fell from 4.19 to 3.66 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bonab ranked 5th out of 8 cities in East Azarbaijan and 123rd out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
3.66
Rank in Iran
110th of 169
Rank in East Azarbaijan
3rd of 8

Entire Network (Aggregate)

SNDi value
3.5
Rank in Iran
123rd of 169
Rank in East Azarbaijan
5th of 8

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

What about similarly populated cities?

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
BonabLa OrotavaElk

In new street additions, Bonab built increasingly disconnected streets from 1975 through 1991-2005, then improved, while La Orotava built increasingly disconnected streets from 1975 through 1976-1990, then improved and Elk fluctuated in its street-construction patterns. For the full network, Bonab became progressively more disconnected, while La Orotava grew more disconnected from 1975 through 1976-1990, then improved and Elk fluctuated in connectivity. Notably, Bonab had a more connected network than La Orotava in 1975 but the two have since reversed their relative ranking.