Brockton in context: Street-network sprawl trends

Brockton in context

3456<19751976–19901991–20052006–2020SNDi of street additions
3456<19751976–19901991–20052006–2020SNDi of entire street network
BrocktonMassachusetts (Region)United States (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Brockton plotted against Massachusetts and United States. While Massachusetts and United States both peaked in 1991-2005, Brockton's new street additions peaked in 1991-2005. Most recently, Brockton's incremental SNDi fell from 5.92 to 2.55 between 1991-2005 and 2006-2020. In terms of the aggregate network, Brockton ranked 5th out of 10 cities in Massachusetts and 96th out of 333 in United States as of 2020.

New Street Additions (2006–2020)

SNDi value
2.55
Rank in United States
21st of 333
Rank in Massachusetts
2nd of 10

Entire Network (Aggregate)

SNDi value
2.6
Rank in United States
96th of 333
Rank in Massachusetts
5th of 10

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

What about similarly populated cities?

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
BrocktonTomohonBaishui

In new street additions, Brockton and Tomohon both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Baishui built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Brockton and Baishui have been converging in their street-network character since 1975.