Haiyangsuo 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 Haiyangsuo plotted against Shandong and China. The SNDi of new construction in Haiyangsuo peaked in 1976-1990, compared to Shandong which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Haiyangsuo's incremental SNDi fell from 1.24 to 0.99 between 1991-2005 and 2006-2020. In terms of the aggregate network, Haiyangsuo ranked 2nd out of 124 cities in Shandong and 7th 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?

• Gushan, China
• Pipra, India
• Xianhu Economic Development Zone, China
• Xincheng, China
• Dayr Abu Hinnis, Egypt
• Harapanahalli, India

In new street additions, Haiyangsuo built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Gushan built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Xincheng fluctuated in its street-construction patterns. For the full network, Haiyangsuo grew more disconnected from 1975 through 1976-1990, then improved, while Gushan became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards and Xincheng became progressively more connected. Haiyangsuo and Gushan have been converging in their street-network character since 1975.