Resilient city street network

Is Your City Ready? How Smart Street Design Can Save Lives

Lena Kashyap in Climate & Environment August 2025 • 4 min read.

"New research reveals the secrets to resilient urban networks in the face of disasters, from floods to targeted attacks. Discover how simple design tweaks can dramatically improve your city's ability to bounce back."

Imagine a city where a flood doesn't paralyze the streets, an earthquake doesn't cut off neighborhoods, and a targeted attack doesn't cripple the flow of daily life. That's the promise of resilient street network design – creating urban landscapes that can bend, not break, when disaster strikes. We rely on street networks to move people and goods, and these networks are increasingly vulnerable to various disruptions.

But what makes one city's street network more resilient than another? Is it the layout, the number of intersections, or something else entirely? Until recently, these questions remained largely unanswered. Now, groundbreaking research is shedding light on the secrets of urban resilience, offering a blueprint for cities around the world to build stronger, safer, and more adaptable communities.

This article unpacks the key findings, translating complex data into actionable insights for urban planners, policymakers, and anyone who cares about the future of our cities. We will look at how cities can implement simple design tweaks to dramatically improve resilience.

The Global Street Network: What Makes a City Vulnerable?

A recent study from Geoff Boeing and Jaehyun Ha at the University of Southern California has simulated over 2.4 billion trips across more than 8,000 urban areas in 178 countries, to better understand the secrets of resilient urban networks. This study has offered key insights into the vulnerabilities and strengths inherent in different street network designs. The researchers modeled street networks using OpenStreetMap data, and then simulated different disruptive events, including floods, earthquakes, and targeted attacks, to see how the networks would respond.

Here's what they found:

High-Centrality Nodes Are Risky: Disrupting key intersections or bridges (high-centrality nodes) has a severe impact on how well the network functions. These are the arteries of the city, and blocking them can lead to widespread disruption.
Connectivity is Key: Networks with higher connectivity (more intersections and route options) are less vulnerable. More routes mean more ways to get around when disaster strikes.
Chokepoints Are a Weakness: Fewer chokepoints (areas where traffic is forced to converge) means less vulnerability. Chokepoints create bottlenecks, making the entire network susceptible to failure.
Circuity Matters: Less circuity (more direct routes) leads to greater resilience. Direct routes provide more efficient paths and reduce the impact of disruptions.

These findings reveal a powerful truth: network design has a direct impact on a city's ability to withstand and recover from disasters. Let's dig into why these factors matter and what cities can do to improve.

Building a Resilient Future: What's Next?

The research is clear: street network design is a critical factor in urban resilience. By prioritizing connectivity, reducing chokepoints, and creating more direct routes, cities can build stronger, safer, and more adaptable communities. This isn't just about preparing for the worst; it's about creating better places to live, work, and thrive, no matter what the future holds.

About this Article -

This article was crafted using a human-AI hybrid and collaborative approach. AI assisted our team with initial drafting, research insights, identifying key questions, and image generation. Our human editors guided topic selection, defined the angle, structured the content, ensured factual accuracy and relevance, refined the tone, and conducted thorough editing to deliver helpful, high-quality information.See our About page for more information.

Everything You Need To Know

What are the main vulnerabilities that make a city's street network susceptible to disruption?

According to research by Geoff Boeing and Jaehyun Ha, a city's street network is vulnerable when it has high-centrality nodes (critical intersections or bridges), low connectivity (fewer intersections and route options), many chokepoints (areas where traffic converges), and high circuity (less direct routes). Disruptions to high-centrality nodes can severely impact network function, while a lack of connectivity limits alternative routes. Chokepoints create bottlenecks, and high circuity increases the impact of disruptions by forcing longer, less efficient paths. Addressing these factors can improve urban resilience.

How does increasing connectivity in a city's street network contribute to its resilience during disasters?

Increasing connectivity, meaning more intersections and alternative routes, enhances a city's resilience by providing more options for travel when a disruption occurs. When one route is blocked due to a flood, earthquake, or attack, a highly connected network allows traffic to be redirected through other available paths. This reduces the overall impact of the disruption and helps maintain the flow of people and goods throughout the city. Without high connectivity, isolated incidents can cause cascading failures across the entire network.

Why are 'chokepoints' considered a weakness in a city's street network, and what can be done to mitigate this?

Chokepoints, areas where traffic is forced to converge into a limited number of routes, are weaknesses because they create bottlenecks that make the entire network susceptible to failure. If a disruption occurs at a chokepoint, it can paralyze the entire flow of traffic, leading to widespread gridlock and preventing access to essential services. To mitigate this, cities can invest in creating more redundant routes, improving connectivity around chokepoints, and diversifying transportation options. Reducing reliance on single points of failure improves overall resilience.

How can reducing 'circuity' in street networks contribute to a more resilient urban environment?

Circuity refers to the extent to which routes are indirect. Reducing circuity means creating more direct routes between destinations. Direct routes provide more efficient paths, minimizing the impact of disruptions. When routes are direct, the network is less vulnerable because alternate paths are more likely to be viable substitutes. Less circuity ensures that resources and people can move efficiently even if specific routes are compromised. A network with low circuity also reduces travel times and fuel consumption under normal conditions.

Beyond disaster preparedness, what are some of the broader benefits of implementing resilient street network designs in urban areas?

While resilient street network design is critical for disaster preparedness, it also offers broader benefits that enhance the quality of urban life. By prioritizing connectivity and reducing chokepoints and circuity, cities can improve traffic flow, reduce commute times, and lower fuel consumption, benefiting both the environment and the economy. These design strategies can also make cities more walkable and bikeable, promoting healthier lifestyles and fostering a stronger sense of community. In essence, designing for resilience creates better places to live, work, and thrive, irrespective of whether a disaster strikes.