Turku in context: Street-network sprawl trends

Turku in context

1.622.42.8<19751976–19901991–20052006–2020SNDi of street additions
1.622.42.8<19751976–19901991–20052006–2020SNDi of entire street network
TurkuWestern Finland (Region)Finland (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Turku plotted against Western Finland and Finland. The SNDi of new construction in Turku followed a zig-zag trend with an overall decrease, compared to Western Finland which rose steadily and Finland which rose steadily. Most recently, Turku's incremental SNDi fell from 1.88 to 1.68 between 1991-2005 and 2006-2020. In terms of the aggregate network, Turku ranked 3rd out of 4 cities in Western Finland and 5th out of 6 in Finland as of 2020.

New Street Additions (2006–2020)

SNDi value
1.68
Rank in Finland
1st of 6
Rank in Western Finland
1st of 4

Entire Network (Aggregate)

SNDi value
1.77
Rank in Finland
5th of 6
Rank in Western Finland
3rd of 4

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

What about similarly populated cities?

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
TurkuShuitouLuoping

In new street additions, Turku fluctuated in its street-construction patterns, while Shuitou built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Luoping built increasingly disconnected streets over time. For the full network, Turku and Shuitou both became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Luoping became progressively more disconnected. Notably, Turku had a more sprawly network than Shuitou in 1975 but the two have since reversed their relative ranking.