Street-network Sprawl in Sindelfingen, 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.

Sindelfingen: city in Baden-Württemberg, 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 Sindelfingen, Germany on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Sindelfingen as of 2014, the overall level of street-network sprawl is 0.97, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.93, 1.56, 1.8 and 1.43. Street construction in Sindelfingen 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 Sindelfingen spans a total of 317 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 0.93, 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 0.93, 0.97, 0.97 and 0.97. Overall, the SNDi of the aggregate street network has risen: the street network in Sindelfingen has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.04 points, but between 1991-2000 and 2001-2014, it rose by just 0.0.

Sindelfingen and Baden-Württemberg 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 Sindelfingen fare in comparison to others in Baden-Württemberg? Most recently in 2001-2014, street construction in Sindelfingen was the 10th-most disconnected out of the 14 cities in Baden-Württemberg. Its position in the ranks since 1975 has fallen; relative to other cities in Baden-Württemberg, street construction in Sindelfingen has become more connected. Sindelfingen ranked 8th in 1975, 12th in 1976-1990, 6th in 1991-2000 and 10th in 2001-2014.

Sindelfingen 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 Sindelfingen fare in comparison to others in Germany? Most recently in 2001-2014, street construction in Sindelfingen was the 67th-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 Sindelfingen has become more connected. Sindelfingen ranked 58th in 1975, 66th in 1976-1990, 51st in 1991-2000 and 67th in 2001-2014.

Sindelfingen and Baden-Württemberg follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.

To date, Sindelfingen is the 8th-most disconnected out of the 14 cities in Baden-Württemberg. Its position in the ranks since 1975 has not changed. Sindelfingen ranked 8th in 1975, 8th in 1976-1990, 8th in 1991-2000 and 8th in 2001-2014.

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

To date, Sindelfingen is the 64th-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 Sindelfingen has become more connected. Sindelfingen ranked 58th in 1975, 61st in 1976-1990, 62nd in 1991-2000 and 64th in 2001-2014.

As of 2015, Sindelfingen had a built-up area of 18.46 square kilometers, and a population of 75230 people.

These are some other cities with approximately the same population: