Lahti in context: Street-network sprawl trends

Lahti 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
LahtiWestern Finland (Region)Finland (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Lahti plotted against Western Finland and Finland. The SNDi of new construction in Lahti was at its lowest in 1976-1990, compared to Western Finland which rose steadily and Finland which rose steadily. Most recently, Lahti's incremental SNDi rose from 1.69 to 1.7 between 1991-2005 and 2006-2020. In terms of the aggregate network, Lahti ranked 2nd out of 4 cities in Western Finland and 4th out of 6 in Finland as of 2020.

New Street Additions (2006–2020)

SNDi value
1.7
Rank in Finland
2nd of 6
Rank in Western Finland
2nd of 4

Entire Network (Aggregate)

SNDi value
1.69
Rank in Finland
4th of 6
Rank in Western Finland
2nd of 4

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
LahtiBergamaMinyat al Hayt

In new street additions, Lahti built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Bergama built increasingly disconnected streets from 1975 through 1976-1990, then improved and Minyat al Hayt built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Lahti became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Bergama grew more disconnected from 1975 through 1991-2005, then improved and Minyat al Hayt became progressively more disconnected.