Sanjiao in context: Street-network sprawl trends

Sanjiao in context

2.73.64.55.4<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.4<19751976–19901991–20052006–2020SNDi of entire street network
SanjiaoGuangdong (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sanjiao plotted against Guangdong and China. The SNDi of new construction in Sanjiao was at its lowest in 1991-2005, compared to Guangdong which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Sanjiao's incremental SNDi rose from 2.76 to 3.46 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sanjiao ranked 54th out of 133 cities in Guangdong and 1041st out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.46
Rank in China
1133rd of 1843
Rank in Guangdong
55th of 133

Entire Network (Aggregate)

SNDi value
3.02
Rank in China
1041st of 1843
Rank in Guangdong
54th of 133

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

What about similarly populated cities?

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
SanjiaoYaltaObera

In new street additions, Sanjiao built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Yalta built increasingly disconnected streets from 1975 through 1991-2005, then improved and Oberá fluctuated in its street-construction patterns. Looking at the full network, Yalta and Oberá both became progressively more disconnected, while Sanjiao became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Sanjiao and Yalta have been converging in their street-network character since 1975.