Haikou 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 Haikou plotted against Fujian and China. While Fujian and China both followed a zig-zag trend with an overall increase, Haikou's new street additions followed a zig-zag trend with an overall increase. Most recently, Haikou's incremental SNDi rose from 7.11 to 9.07 between 1991-2005 and 2006-2020. In terms of the aggregate network, Haikou ranked 74th out of 75 cities in Fujian and 1827th 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?

• 黄姑社区, China
• Piduguralla, India
• Longmont, United States
• Bintulu, Malaysia
• Carlisle, United Kingdom
• Mallikpratap, India

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