How AI‑Powered City Brains Are Transforming Urban Governance

In November 2017, Wang Jian, chairman of Alibaba Group's Technical Committee, wrote in the People's Daily about the "city brain," predicting that data resources will become more important than land in future city development.

At the 2017 Hangzhou Cloud Expo, he presented the city brain as essential urban infrastructure.

The recent AI boom is rooted in the internet and cloud computing, which provide massive data and computing power, giving the once‑young discipline a historic development opportunity; without the internet, AI lacks direction.

Since the 1950s AI aimed to mimic human intelligence, but today, with ubiquitous connectivity and data, machine intelligence can solve problems beyond human capability, similar to how steel and electric motors extended human physical abilities.

Sustainable urban development faces many challenges, and machine intelligence—built on internet, data, and computing—offers breakthroughs such as traffic governance, creating opportunities for the AI industry.

China has invested heavily in city informationization for two decades, especially in police traffic departments, accumulating vast video data that remains largely unused. In October 2019, Hangzhou announced the world’s first city‑brain plan, highlighting the disconnect between traffic cameras and signal lights.

The city brain uses the internet as infrastructure, leveraging rich city data for real‑time global analysis, efficient public‑resource allocation, and improved social governance, with data eventually surpassing land in importance.

In Hangzhou, the city brain extracts real‑time traffic flow from camera videos, enabling traffic lights to adjust timing based on live conditions, improving efficiency through computer‑vision‑based instant traffic health checks.

At the recent Cloud Expo, the city brain reduced travel time by 15.3% across 128 signal intersections, generated over 500 daily alerts with 92% accuracy, and enhanced law‑enforcement targeting. It also prioritized emergency vehicle routing, cutting ambulance arrival time by nearly half.

The city brain drives three major breakthroughs: a new governance model that uses data to demand manpower and services; a precise public‑service model that optimizes resource use; and an industrial development model that treats open city data as a foundational resource for traditional and emerging industries.

Suzhou, for example, is adopting the city‑brain framework with a focus on traffic governance, integrating data from police, transportation, urban management, tourism, and rail departments, and applying large‑scale computing and machine intelligence for efficient, safe city operation.

Beyond traffic, the city brain creates a city‑wide nervous system that opens data, enabling instant analysis and decision‑making, allowing data to help cities think, decide, and operate.

China’s advanced internet infrastructure gives it a competitive edge; rapid data accumulation provides a unique opportunity to solve urban challenges faster than other nations.

The city brain also serves as a massive research platform for machine intelligence, akin to the 1960s moon program, positioning China for a leading role in the forthcoming global intelligent era.

Each technological revolution reshapes urban civilization: steam engines built roads, electricity built grids, and now the internet makes data the core resource, making the city brain the next foundational urban infrastructure.