Day After Mass Shooting Sees Rise in Traffic Accidents

At a glance: Researchers analyzed the 10 deadliest U.S. mass shootings from 2008 to 2023 and examined what happened to traffic safety in the next 24 hours. To connect real-world roadway outcomes with public attention, the study combined national crash records with digital behavior metrics.

Using the Fatality Analysis Reporting System (FARS), the investigators measured fatal traffic incidents in the days surrounding each event. They focused on the interval from the 10 days before through the 10 days after a mass shooting, then compared the day immediately following the attack to the pre-event baseline.

The headline result was an increase in fatal crashes. The day after a mass shooting with fatalities, traffic fatalities rose by 14.3%, translating to nearly 20 additional deaths. Importantly, the pattern was consistent across differences in driver demographics and did not concentrate in a single region.

To reduce confounding from predictable shifts in travel patterns, incidents occurring on public holidays were excluded. The widely reported Parkland, Florida shooting on Valentine’s Day was also omitted to avoid the special holiday travel context.

The team also tested whether events without fatalities produced the same signal. There was no comparable increase after active shooter incidents where no traffic fatalities occurred, suggesting the effect was linked to the visibility and consequences of the event, not simply to the presence of news.

Digital exposure appeared to mirror the physical risk. Using Google Trends, researchers found that public internet search interest peaked the day after each shooting, indicating broad dissemination of information soon after the event. That timing aligns with the spike in fatal roadway outcomes.

Mechanistically, the authors propose that acute psychological stress can impair attention and decision-making, potentially increasing crash risk. However, the analysis cannot disentangle psychological distress from media-related distraction, leaving open multiple pathways to explain the observed association.

Published in JAMA Psychiatry on July 15, 2026, the study adds to a growing body of evidence that attention disruptions—whether emotional or informational—may contribute to motor vehicle collisions at a population scale.

Overall, the findings frame mass shootings as not only a mental health crisis but also a short-term public safety shock that appears on the road the next day.