Street-network Sprawl in Taranto, Italy

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.

Taranto: city in Apulia, Italy

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 Taranto, Italy on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Taranto as of 2014, the overall level of street-network sprawl is 0.49, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.11, 0.71, nan and 7.24. Data was not available in 1991-2000.

Quantity of street network construction: The street network in Taranto spans a total of 297 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 0.71, 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 0.11, 0.47, 0.48 and 0.49. Overall, the SNDi of the aggregate street network has risen: the street network in Taranto has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.36 points, but between 1991-2000 and 2001-2014, it rose by just 0.01.

Taranto and Apulia do not follow the same trend in the disconnectivity of their street network constructions. There was not enough data from the city, while the SNDi of street constructions in Apulia rose steadily.

How do development practices in Taranto fare in comparison to others in Apulia? Most recently in 2001-2014, street construction in Taranto was the 1st-most disconnected out of the 13 cities in Apulia. Its position in the ranks since 1975 has fallen; relative to other cities in Apulia, street construction in Taranto has become more connected. Taranto ranked 8th in 1975, 11th in 1976-1990 and 1st in 2001-2014. There was no ranking in 1991-2000 due to unavailable data.

Taranto and Italy do not follow the same trend in the disconnectivity of their street network constructions. There was not enough data from the city, while the SNDi of street constructions in Italy peaked in 1991-2000.

How do development practices in Taranto fare in comparison to others in Italy? Most recently in 2001-2014, street construction in Taranto was the 7th-most disconnected out of the 91 cities in Italy. Its position in the ranks since 1975 has fallen; relative to other cities in Italy, street construction in Taranto has become more connected. Taranto ranked 84th in 1975, 86th in 1976-1990 and 7th in 2001-2014. There was no ranking in 1991-2000 due to unavailable data.

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

To date, Taranto is the 7th-most disconnected out of the 13 cities in Apulia. Its position in the ranks since 1975 has risen; relative to other cities in Apulia, the street network in Taranto has become more disconnected. Taranto ranked 8th in 1975, 7th in 1976-1990, 7th in 1991-2000 and 7th in 2001-2014.

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

To date, Taranto is the 82nd-most disconnected out of the 91 cities in Italy. Its position in the ranks since 1975 has risen; relative to other cities in Italy, the street network in Taranto has become more disconnected. Taranto ranked 84th in 1975, 82nd in 1976-1990, 82nd in 1991-2000 and 82nd in 2001-2014.

As of 2015, Taranto had a built-up area of 31.2 square kilometers, and a population of 132440 people.

These are some other cities with approximately the same population: