Street-network Sprawl in Brunswick, Germany

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.

Brunswick: city in Niedersachsen, Germany

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 Brunswick, Germany on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Brunswick as of 2014, the overall level of street-network sprawl is 1.23, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 1.11, 2.03, 3.04 and 1.94. Street construction in Brunswick increased in disconnectivity initially but has since improved. The streets constructed in 1991-2000 were the most disconnected.

Quantity of street network construction: The street network in Brunswick spans a total of 696 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 1.11, 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 1.11, 1.2, 1.22 and 1.23. Overall, the SNDi of the aggregate street network has risen: the street network in Brunswick has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.09 points, but between 1991-2000 and 2001-2014, it rose by just 0.02.

Brunswick and Niedersachsen do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Brunswick peaked in 1991-2000, while the SNDi of street constructions in Niedersachsen rose steadily.

How do development practices in Brunswick fare in comparison to others in Niedersachsen? Most recently in 2001-2014, street construction in Brunswick was the 8th-most disconnected out of the 9 cities in Niedersachsen. Its position in the ranks since 1975 has fallen; relative to other cities in Niedersachsen, street construction in Brunswick has become more connected. Brunswick ranked 5th in 1975, 3rd in 1976-1990, 5th in 1991-2000 and 8th in 2001-2014.

Brunswick and Germany follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these peaked in 1991-2000.

How do development practices in Brunswick fare in comparison to others in Germany? Most recently in 2001-2014, street construction in Brunswick was the 57th-most disconnected out of the 87 cities in Germany. Its position in the ranks since 1975 has fallen; relative to other cities in Germany, street construction in Brunswick has become more connected. Brunswick ranked 37th in 1975, 39th in 1976-1990, 24th in 1991-2000 and 57th in 2001-2014.

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

To date, Brunswick is the 5th-most disconnected out of the 9 cities in Niedersachsen. Its position in the ranks since 1975 has not changed. Brunswick ranked 5th in 1975, 6th in 1976-1990, 5th in 1991-2000 and 5th in 2001-2014.

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

To date, Brunswick is the 42nd-most disconnected out of the 87 cities in Germany. Its position in the ranks since 1975 has fallen; relative to other cities in Germany, the street network in Brunswick has become more connected. Brunswick ranked 37th in 1975, 43rd in 1976-1990, 42nd in 1991-2000 and 42nd in 2001-2014.

As of 2015, Brunswick had a built-up area of 47.0 square kilometers, and a population of 180612 people.

These are some other cities with approximately the same population: