New York City has begun embedding a network of sensors beneath its sidewalks and streets, a project called Under Your Feet that promises real-time data on infrastructure stability, air quality and pedestrian traffic patterns. The first phase covers a five-block stretch of Lower Manhattan, with plans to expand citywide by 2027.

What You Need to Know

Under Your Feet is a collaboration between the NYC Department of Transportation and private technology firms. The sensors measure vibration, temperature and gas levels to detect cracks and leaks before they become hazards. Data is transmitted via low-power wide-area networks to a central dashboard open to city officials and researchers.

How the Sensors Work

The system relies on ruggedized environmental sensors encased in concrete and placed up to three feet below street level. Each unit is powered by a small battery designed to last five years without replacement. The sensors communicate using LoRaWAN, a protocol built for long-range, low-bandwidth IoT applications.

  • Structural monitoring: Accelerometers detect subtle shifts in pavement and subgrade that may signal sinkholes or foundation erosion.
  • Environmental sensing: Electrochemical sensors track carbon monoxide, methane and particulate matter close to ground level.
  • Pedestrian counting: Passive infrared sensors estimate foot-traffic volumes without capturing identifiable images.

Broader Trends in Urban Infrastructure

The Under Your Feet project mirrors a global push to digitize city assets. London, Tokyo and Singapore have deployed similar sensor grids to monitor bridges and tunnels. What sets New York City apart is the density of its subsurface environment, which includes century-old water mains, subway tunnels and fiber-optic cables. The sensor network is designed to coexist with these systems without interfering with existing services.

Why This Matters

For city residents and commuters, the immediate benefit is faster repairs and fewer street closures. The city estimates that early detection of structural issues could reduce emergency repair costs by 30 percent. For urban planners and climate researchers, the long-term data set will offer insights into how aging infrastructure responds to heavier rainfall and rising temperatures. Under Your Feet turns every block into a lab, and that shift could change how cities budget for maintenance.

Challenges Ahead

Privacy advocates have raised concerns about the pedestrian-counting sensors, though the city insists no personal data is collected. Battery life in extreme weather conditions also remains untested at scale. Still, the project is one of the most aggressive municipal IoT deployments in the United States and will serve as a template for other major cities considering similar investments.