Islampur 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 Islampur plotted against Bihar and India. The SNDi of new construction in Islampur was at its lowest in 1976-1990, compared to Bihar which followed a zig-zag trend with an overall increase and India which followed a zig-zag trend with an overall increase. Most recently, Islampur's incremental SNDi rose from 3.37 to 5.48 between 1991-2005 and 2006-2020. In terms of the aggregate network, Islampur ranked 71st out of 264 cities in Bihar as of 2020.

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

What about similarly populated cities?

• Talagang, Pakistan
• Lujiang, China
• Xiaoxian, China
• Yingshan, China
• Deqing, China
• Wuchang, China

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