Manchester in context: Street-network sprawl trends

Manchester in context

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
ManchesterNew Hampshire (Region)United States (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Manchester plotted against New Hampshire and United States. The SNDi of new construction in Manchester peaked in 1976-1990, compared to New Hampshire which peaked in 1976-1990 and United States which peaked in 1991-2005. Most recently, Manchester's incremental SNDi fell from 3.21 to 2.71 between 1991-2005 and 2006-2020. In terms of the aggregate network, Manchester ranked 1st out of 1 cities in New Hampshire and 27th out of 333 in United States as of 2020.

New Street Additions (2006–2020)

SNDi value
2.71
Rank in United States
30th of 333
Rank in New Hampshire
1st of 1

Entire Network (Aggregate)

SNDi value
1.9
Rank in United States
27th of 333
Rank in New Hampshire
1st of 1

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

What about similarly populated cities?

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
ManchesterDschangMechelen

While Dschang and Mechelen both built increasingly disconnected streets from 1975 through 1991-2005, then improved, Manchester built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. For the full street network, though, all three cities follow the same trend. Manchester and Dschang have been growing further apart in their street-network character since 1975.