St. Helier in context: Street-network sprawl trends

St. Helier in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
St. HelierSaint Helier (Region)Jersey (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with St. Helier plotted against Saint Helier and Jersey. The SNDi of new construction in St. Helier rose steadily, compared to Saint Helier which peaked in 1976-1990 and Jersey which peaked in 1976-1990. Most recently, St. Helier's incremental SNDi rose from 3.9 to 4.35 between 1991-2005 and 2006-2020. In terms of the aggregate network, St. Helier ranked 1st out of 1 cities in Saint Helier and 1st out of 1 in Jersey as of 2020.

New Street Additions (2006–2020)

SNDi value
4.35
Rank in Jersey
1st of 1
Rank in Saint Helier
1st of 1

Entire Network (Aggregate)

SNDi value
2.42
Rank in Jersey
1st of 1
Rank in Saint Helier
1st of 1

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

What about similarly populated cities?

08162432<19751976–19901991–20052006–2020SNDi of street additions
08162432<19751976–19901991–20052006–2020SNDi of entire street network
St. HelierMineirosChandanpur

In new street additions, St. Helier and Mineiros both built increasingly disconnected streets over time, while Chandanpur fluctuated in street-construction patterns. For the full network, St. Helier and Mineiros both became progressively more disconnected, while Chandanpur fluctuated in connectivity.