Dangtu 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 Dangtu plotted against Anhui and China. The SNDi of new construction in Dangtu was at its lowest in 1976-1990, compared to Anhui which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Dangtu's incremental SNDi rose from 2.17 to 2.19 between 1991-2005 and 2006-2020. In terms of the aggregate network, Dangtu ranked 20th out of 74 cities in Anhui and 255th out of 1843 in China as of 2020.

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

What about similarly populated cities?

• Dalauabari, Bangladesh
• Sibi, Pakistan
• Columbia, United States
• Madang, Papua New Guinea
• Lào Cai, Vietnam
• Mertule Mariam, Ethiopia

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