Street-network Sprawl in Ago Are, Nigeria

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.

Ago Are: city in Oyo, Nigeria

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 Ago Are, Nigeria on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Ago Are as of 2014, the overall level of street-network sprawl is 0.25, which is very well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are -0.78, 0.11, 0.01 and 0.63. Disconnectivity in street construction in Ago Are 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 Ago Are spans a total of 61 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 0.63, 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 -0.78, -0.64, -0.53 and 0.25. Overall, the SNDi of the aggregate street network has risen: the street network in Ago Are has become more disconnected.

Ago Are and Oyo follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these followed a zig-zag trend with an overall increase.

How do development practices in Ago Are fare in comparison to others in Oyo? Most recently in 2001-2014, street construction in Ago Are was the 13th-most disconnected out of the 15 cities in Oyo. Its position in the ranks since 1975 has not changed. Ago Are ranked 13th in 1975, 11th in 1976-1990, 10th in 1991-2000 and 13th in 2001-2014.

Ago Are and Nigeria do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Ago Are followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Nigeria peaked in 1991-2000.

How do development practices in Ago Are fare in comparison to others in Nigeria? Most recently in 2001-2014, street construction in Ago Are was the 313th-most disconnected out of the 411 cities in Nigeria. Its position in the ranks since 1975 has fallen; relative to other cities in Nigeria, street construction in Ago Are has become more connected. Ago Are ranked 233rd in 1975, 280th in 1976-1990, 245th in 1991-2000 and 313th in 2001-2014.

Ago Are and Oyo do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Ago Are rose steadily, while the SNDi of street constructions in Oyo followed a zig-zag trend with an overall increase.

To date, Ago Are is the 13th-most disconnected out of the 15 cities in Oyo. Its position in the ranks since 1975 has not changed. Ago Are ranked 13th in 1975, 14th in 1976-1990, 14th in 1991-2000 and 13th in 2001-2014.

Ago Are and Nigeria follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.

To date, Ago Are is the 333rd-most disconnected out of the 411 cities in Nigeria. Its position in the ranks since 1975 has fallen; relative to other cities in Nigeria, the street network in Ago Are has become more connected. Ago Are ranked 233rd in 1975, 348th in 1976-1990, 357th in 1991-2000 and 333rd in 2001-2014.

As of 2015, Ago Are had a built-up area of 0.99 square kilometers, and a population of 58196 people.

These are some other cities with approximately the same population: