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The hidden safety risks of permanent DST
A modeling study projects 2.14 billion additional pre-sunrise commutes annually and find greater odds of pedestrian involvement in fatal morning crashes.
Clinical Scorecard: The hidden safety risks of permanent DST
At a Glance
Category
Detail
Condition
School commute exposure and pedestrian safety under alternative clock systems
Key Mechanisms
Permanent DST shifts winter sunrise later by the clock, increasing projected pre-sunrise school commutes. In an observational analysis, fatal crashes before sunrise had higher adjusted odds of involving a pedestrian than crashes after sunrise; this does not establish causation.
Target Population
School-aged children; analyses covered public schools and fatal crashes involving pedestrians aged 5 to 18 years
Care Setting
US public-school commute and traffic-safety context; the study used modeling and observational analyses, not a clinical care setting.
Key Highlights
Across 14 states, estimated annual dark-morning school commute exposure was approximately 554 million child-days under permanent DST, 198 million under the current seasonal system, and 97 million under permanent standard time.
The nationwide model projected approximately 2.14 billion additional pre-sunrise commutes annually under permanent DST compared with the current system, assuming an 8 AM departure.
Earlier school start times and locations farther west within time zones were associated with more projected pre-sunrise commutes.
Among fatal crashes during school-year weekday mornings, crashes before sunrise had 1.77 times the adjusted odds of involving a pedestrian compared with crashes after sunrise. For pedestrians aged 5 to 18 years, the adjusted odds were 2.22 times higher; this subgroup analysis included 141 pedestrian-involved fatal crashes.
The analyses do not establish that permanent DST would directly increase pedestrian injuries or fatalities. Commute estimates relied on assumed departure times, and crash data included fatal crashes only.
Guideline-Based Recommendations
Diagnosis
Management
Monitoring & Follow-up
Risks
Patient & Prescribing Data
Not applicable; this was a modeling and observational study of school commute exposure and fatal traffic crashes, not a treatment study.
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