Adjustment disorder triggered by a unique and pervasive urban stressor, traffic cones: A case report

BACKGROUND The “Montreal syndrome” is an emerging urban stress-related condition characterized by rage and anxiety triggered by the sight of construction cones, particularly prevalent in Montreal, Canada. This case represents the first medically documented instance of conophobia-induced road rage. CASE SUMMARY A 52-year-old man experienced an episode of intense anger and impulsive driving after encountering a series of orange traffic cones near his home. The event included verbal aggression, a traffic violation, and lingering emotional distress. He reported no prior psychiatric history, and imaging confirmed that a coincidental scalp mass was a benign lipoma, ruling out organic causes. The episode led to symptoms consistent with adjustment disorder with mixed emotional features, without meeting criteria for intermittent explosive disorder. This case illustrates how environmental stressors in urban settings can provoke atypical behavioral responses in otherwise mentally healthy individuals. The “Montreal syndrome”, defined by conophobia, avoidance, mood disturbance, and impulsive behavior, offers insight into how chronic urban disruption may impact public mental health. The phenomenon is further contextualized alongside other city-named syndromes such as Stockholm and Florence syndromes. CONCLUSION The “Montreal syndrome” underscores the psychological impact of urban infrastructure. This case highlights the need for clinicians to recognize novel forms of situational distress and for urban planners to consider the mental health consequences of the built environment.