Street-network Sprawl in Ciudad Acuña, Mexico

What is Street-network sprawl?

Street-network Sprawl is a way to measure urban sprawl, worldwide, through the connectedness of the streets. Less sprawl means more connected, more walkable streets. Well-connected streets – like New York City’s grid – are more walkable and can be served by public transit.

The street network is permanent, and its connectivity affects the livability and environmental footprint of cities for decades and centuries to come. In places with more connected streets, residents drive less and walk more. A well-connected street network is associated with better outcomes for health, the environment, sustainable consumption, social integration, and equity.

We can quantify how connected street networks are with the Street Network Disconnectedness Index (SNDi).

SNDi -- our measure of street-network sprawl (disconnectedness)

The SNDi is a comprehensive measurement of “sprawl”. It captures:

A higher SNDi means less-connected streets – i.e., more sprawl. For the 10137 cities in our dataset, the average SNDi is 2.25, with half of the cities' SNDis falling between 1.08 and 3.25.

More information on the sprawl index can be found in these research papers:

To see the state of street-network sprawl across the globe, visit the sprawlmap.

Ciudad Acuña: city in Coahuila, Mexico

What exactly constitutes the spatial extent of the city? For these aggregations, we used the Global Human Settlement Layer Urban Center Database (GHS-UCDB) to define the boundaries of the city. These cities -- or urban centers -- cover areas that are densely populated and built-up, and so may extend beyond the spatial borders of these cities that we may be familiar with. The GHS area is shaded in blue.

View Ciudad Acuña, Mexico on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Ciudad Acuña as of 2014, the overall level of street-network sprawl is 1.44, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.36, 1.56, 1.38 and 2.21. Disconnectivity in street construction in Ciudad Acuña follows a zig-zag trend. In 1975, street construction was most disconnected, while construction was most connected in 2001-2014.

Quantity of street network construction: The street network in Ciudad Acuña spans a total of 604 kilometers. The period with the greatest volume of street construction was 1976-1990. These roads have an SNDi of 1.56, which is relatively well-connected.

Effect on the aggregate network: New construction in each period adds to the total stock of streets, but does not change streets that have already been built. Therefore, it has a limited effect on the street network as a whole. The SNDis of the aggregate street network in the respective time periods are 0.36, 1.24, 1.3 and 1.44. Overall, the SNDi of the aggregate street network has risen: the street network in Ciudad Acuña has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.88 points, but between 1991-2000 and 2001-2014, it rose by just 0.14.

Ciudad Acuña and Coahuila do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Ciudad Acuña followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Coahuila was at its lowest in 1976-1990.

How do development practices in Ciudad Acuña fare in comparison to others in Coahuila? Most recently in 2001-2014, street construction in Ciudad Acuña was the 6th-most disconnected out of the 8 cities in Coahuila. Its position in the ranks since 1975 has not changed. Ciudad Acuña ranked 6th in 1975, 2nd in 1976-1990, 5th in 1991-2000 and 6th in 2001-2014.

Ciudad Acuña and Mexico do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Ciudad Acuña followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Mexico rose steadily.

How do development practices in Ciudad Acuña fare in comparison to others in Mexico? Most recently in 2001-2014, street construction in Ciudad Acuña was the 133rd-most disconnected out of the 166 cities in Mexico. Its position in the ranks since 1975 has fallen; relative to other cities in Mexico, street construction in Ciudad Acuña has become more connected. Ciudad Acuña ranked 108th in 1975, 100th in 1976-1990, 136th in 1991-2000 and 133rd in 2001-2014.

Ciudad Acuña and Coahuila do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Ciudad Acuña rose steadily, while the SNDi of street constructions in Coahuila was at its lowest in 1976-1990.

To date, Ciudad Acuña is the 5th-most disconnected out of the 8 cities in Coahuila. Its position in the ranks since 1975 has risen; relative to other cities in Coahuila, the street network in Ciudad Acuña has become more disconnected. Ciudad Acuña ranked 6th in 1975, 3rd in 1976-1990, 3rd in 1991-2000 and 5th in 2001-2014.

Ciudad Acuña and Mexico follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.

To date, Ciudad Acuña is the 119th-most disconnected out of the 166 cities in Mexico. Its position in the ranks since 1975 has fallen; relative to other cities in Mexico, the street network in Ciudad Acuña has become more connected. Ciudad Acuña ranked 108th in 1975, 102nd in 1976-1990, 109th in 1991-2000 and 119th in 2001-2014.

As of 2015, Ciudad Acuña had a built-up area of 20.4 square kilometers, and a population of 143659 people.

These are some other cities with approximately the same population: