Tancheng in context: Street-network sprawl trends

Tancheng in context

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
TanchengShandong (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tancheng plotted against Shandong and China. The SNDi of new construction in Tancheng 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, Tancheng's incremental SNDi fell from 2.05 to 1.64 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tancheng ranked 31st out of 124 cities in Shandong and 172nd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.64
Rank in China
99th of 1843
Rank in Shandong
16th of 124

Entire Network (Aggregate)

SNDi value
1.89
Rank in China
172nd of 1843
Rank in Shandong
31st of 124

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
TanchengHeiheLiangmatai

While Heihe and Liangmatai both fluctuated in its street-construction patterns, Tancheng built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. For the full network, Tancheng grew more disconnected from 1975 through 1991-2005, then improved, while Heihe grew more disconnected from 1975 through 1976-1990, then improved and Liangmatai became progressively more disconnected. Notably, Tancheng had a more connected network than Liangmatai in 1975 but the two have since reversed their relative ranking.