The level of street-network sprawl in new development in Zambales peaked in 1991-2005. To get a sense of how street development has changed in Zambales, we can consider two of its most populous cities: Olongapo and Subic. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Olongapo followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Subic followed a zig-zag trend with an overall increase.

How do development practices in Zambales fare in comparison to others in Philippines? Most recently in 2006-2020, street construction in Zambales was the 33rd-most disconnected out of the 57 regions in Philippines. Its position in the ranks since 1975 has fallen; relative to other regions in Philippines, street construction in Zambales has become more connected. Zambales ranked 19th in 1975, 44th in 1976-1990, 54th in 1991-2005 and 33rd in 2006-2020.

As of 2020, the city with the most disconnected street network in Zambales is Subic with an SNDi of 5.61, which is very sprawly. Conversely, the most connected city is Olongapo with an SNDi of 4.89, which is very sprawly. See trends for these cities: Olongapo, Subic

The level of street-network sprawl in the aggregate network in Zambales rose steadily. To get a sense of how the aggregate street network has changed in Zambales, we can consider two of its most populous cities: Olongapo and Subic. Out of the two cities, Subic does not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Subic followed a zig-zag trend with an overall increase.

To date, Zambales is the 36th-most disconnected out of the 57 regions in Philippines. Its position in the ranks since 1975 has fallen; relative to other regions in Philippines, the street network in Zambales has become more connected. Zambales ranked 19th in 1975, 32nd in 1976-1990, 36th in 1991-2005 and 36th in 2006-2020.