Urban Road Infrastructure Linked to Higher Schizophrenia Rates, Study Finds
Researchers from Brown University and Columbia University found that New York City neighborhoods cut off by heavy road traffic and poor pedestrian infrastructure had more schizophrenia-related hospital visits. The study, published April 27, calls for urban planning that reduces car dependence.
A study published on April 27, 2026, by researchers at Brown University and Columbia University Schools of Public Health found that urban neighborhoods isolated by roads and heavy traffic are associated with higher rates of schizophrenia-related hospital visits.
The research focused on New York City and used a "Community Severance Index" to measure how much roads, traffic patterns, and a lack of pedestrian infrastructure physically and socially disconnect neighborhoods. Communities with higher severance scores had more schizophrenia-related hospitalizations across all age groups.
The effect held even after researchers controlled for traffic-related air pollution, suggesting that social isolation itself, not just pollution, plays a role in mental health outcomes.
"When roads cut communities off from each other, people lose access to goods, services, and social connections," said one of the study's authors. "That kind of isolation has real consequences for mental health."
The researchers said the mechanisms likely include reduced physical activity, increased psychological stress from road safety concerns, and fewer opportunities for social interaction. All of these factors have been linked to worse mental health outcomes in previous research.
The study adds to a growing body of evidence connecting the built environment to mental health. Earlier research has linked green space, walkability, and access to public transit to better psychological well-being.
The authors called for urban planners and policymakers to prioritize pedestrian infrastructure, reduce car dependence, and design neighborhoods that encourage social connection.
The findings were published in a peer-reviewed public health journal and have drawn attention from city planners in New York and other major urban centers.
