Tarlac City in context: Street-network sprawl trends

Tarlac City in context

4.55.46.37.2<19751976–19901991–20052006–2020SNDi of street additions
4.55.46.37.2<19751976–19901991–20052006–2020SNDi of entire street network
Tarlac CityTarlac (Region)Philippines (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tarlac City plotted against Tarlac and Philippines. The SNDi of new construction in Tarlac City peaked in 1991-2005, compared to Tarlac which followed a zig-zag trend with an overall increase and Philippines which rose steadily. Most recently, Tarlac City's incremental SNDi fell from 5.56 to 4.94 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tarlac City ranked 2nd out of 3 cities in Tarlac and 63rd out of 114 in Philippines as of 2020.

New Street Additions (2006–2020)

SNDi value
4.94
Rank in Philippines
29th of 114
Rank in Tarlac
3rd of 3

Entire Network (Aggregate)

SNDi value
4.88
Rank in Philippines
63rd of 114
Rank in Tarlac
2nd of 3

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

What about similarly populated cities?

3.64.55.46.3<19751976–19901991–20052006–2020SNDi of street additions
3.64.55.46.3<19751976–19901991–20052006–2020SNDi of entire street network
Tarlac CityAl RodaPhuthaditjhaba

While Al Roda and Phuthaditjhaba both fluctuated in its street-construction patterns, Tarlac City built increasingly disconnected streets from 1975 through 1991-2005, then improved in new street additions. For the full network, Tarlac City became progressively more disconnected, while Al Roda fluctuated in connectivity and Phuthaditjhaba grew more disconnected from 1975 through 1976-1990, then improved. Tarlac City and Al Roda have been converging in their street-network character since 1975.