Tabriz in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tabriz plotted against East Azarbaijan and Iran. The SNDi of new construction in Tabriz was at its lowest in 1976-1990, compared to East Azarbaijan which rose steadily and Iran which rose steadily. Most recently, Tabriz's incremental SNDi rose from 3.95 to 3.98 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tabriz ranked 6th out of 8 cities in East Azarbaijan and 135th out of 169 in Iran as of 2020.

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

What about similarly populated cities?

• Saharanpur, India
• Srinagar, Jammu and Kashmir
• Minneapolis [Saint Paul], United States
• Austin, United States
• Jalandhar, India
• Yekaterinburg, Russia

In new street additions, Tabriz built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Saharanpur fluctuated in its street-construction patterns and Austin built increasingly disconnected streets over time. Looking at the full network, Saharanpur and Austin both became progressively more disconnected, while Tabriz became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Tabriz had a more sprawly network than Saharanpur in 1975 but the two have since reversed their relative ranking.