Allen in context: Street-network sprawl trends

Allen in context

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
AllenTexas (Region)United States (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Allen plotted against Texas and United States. While Texas and United States both peaked in 1991-2005, Allen's new street additions peaked in 1991-2005. Most recently, Allen's incremental SNDi fell from 2.97 to 2.75 between 1991-2005 and 2006-2020. In terms of the aggregate network, Allen ranked 15th out of 42 cities in Texas and 114th out of 333 in United States as of 2020.

New Street Additions (2006–2020)

SNDi value
2.75
Rank in United States
34th of 333
Rank in Texas
8th of 42

Entire Network (Aggregate)

SNDi value
2.77
Rank in United States
114th of 333
Rank in Texas
15th of 42

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

What about similarly populated cities?

22.42.83.2<19751976–19901991–20052006–2020SNDi of street additions
22.42.83.2<19751976–19901991–20052006–2020SNDi of entire street network
AllenGuchengHengelo

In new street additions, Allen and Gucheng both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Hengelo built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Allen grew more disconnected from 1975 through 1991-2005, then improved, while Gucheng became progressively more disconnected and Hengelo grew more disconnected from 1975 through 1976-1990, then improved. Allen and Hengelo have been growing further apart in their street-network character since 1975.