Yicheng in context: Street-network sprawl trends

Yicheng in context

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
YichengHubei (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yicheng plotted against Hubei and China. The SNDi of new construction in Yicheng peaked in 1991-2005, compared to Hubei which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yicheng's incremental SNDi fell from 3.1 to 2.38 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yicheng ranked 22nd out of 77 cities in Hubei as of 2020.

New Street Additions (2006–2020)

SNDi value
2.38
Rank in Hubei
18th of 77

Entire Network (Aggregate)

SNDi value
2.53
Rank in Hubei
22nd of 77

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
YichengWaukeganGanda

In new street additions, Yicheng and Ganda both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Waukegan built increasingly disconnected streets over time. Looking at the full network, Waukegan and Ganda both became progressively more disconnected, while Yicheng grew more disconnected from 1975 through 1991-2005, then improved. Notably, Yicheng had a more sprawly network than Ganda in 1975 but the two have since reversed their relative ranking.