Tours in context: Street-network sprawl trends

Tours in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
ToursCentre-Val de Loire (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tours plotted against Centre-Val de Loire and France. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Tours's incremental SNDi fell from 3.03 to 2.95 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tours ranked 2nd out of 4 cities in Centre-Val de Loire and 31st out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
2.95
Rank in France
27th of 73
Rank in Centre-Val de Loire
2nd of 4

Entire Network (Aggregate)

SNDi value
2.43
Rank in France
31st of 73
Rank in Centre-Val de Loire
2nd of 4

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

What about similarly populated cities?

22.53<19751976–19901991–20052006–2020SNDi of street additions
22.53<19751976–19901991–20052006–2020SNDi of entire street network
ToursBrasovUnaizah

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