Scientists at the University of Washington have raised concerns about the potential consequences of implementing permanent daylight saving time nationwide, focusing specifically on its impact on children’s school commutes. The research team examined enrollment data, school start times, and geographic coordinates across 14 states that have already approved measures supporting the change. Their analysis found that permanent daylight saving time would significantly increase the number of trips children make to school before sunrise compared with the current system of changing clocks twice annually.
The calculations revealed substantial regional variations in impact. Washington state alone would experience approximately 35 million additional dark school commutes, while Georgia showed the largest increase at roughly 71 million additional trips before sunrise. When extrapolated nationwide, the researchers estimated that permanent daylight saving time would result in at least 2 billion more journeys to school in darkness. The team noted that this figure may underestimate the true impact, as many children begin traveling earlier than the 8 a.m. departure time used in their calculations. Schools located near the western boundaries of time zones and those with early morning start times would face the greatest increases in dark commutes.
Beyond safety considerations, the research highlighted health implications related to children’s exposure to morning sunlight. Early daylight plays a crucial role in regulating circadian rhythms, which influence sleep, mood, and appetite. The permanent shift would deprive children of valuable morning light exposure at a critical time for biological development. Traffic analysis showed that fatal crashes involving school-aged pedestrians were approximately twice as likely during dark morning conditions compared with daytime hours. The findings, published in the journal Current Biology, underscore concerns that permanent daylight saving time would disproportionately affect younger children with fixed school schedules who cannot adjust their morning routines independently.
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