Daylight Saving Time and Rush Hour: Why November Commutes Get More Dangerous
When daylight saving time ends on November 1st, a lot of ordinary 5 and 6 p.m. commutes across St. Louis suddenly happen after sunset for the first time all year — and crash rates measurably rise in the days right after.
Why the Switch Is Riskier Than It Seems
- Even a one-hour shift disrupts sleep more than most people expect, with studies showing a sharp rise in trouble falling asleep the week after the change
- Nearly half of all traffic fatalities happen at night, and the switch pushes rush hour into darkness for many drivers overnight
- Deer-vehicle crashes rise nearly 16 percent in the weeks following the fall time change, compounding the risk
What Actually Helps
Turn headlights on earlier than feels necessary, slow down on routes that suddenly feel unfamiliar in the dark, and build in a few extra minutes rather than rushing through the adjustment period. Most people fully adjust within one to two weeks, but the first several days carry the highest measurable risk.
Frequently Asked Questions
Why do crashes rise after daylight saving time ends?
A combination of disrupted sleep, evening commutes suddenly happening in darkness, and rising deer activity in the same window.
How long does the adjustment period last?
Most people adjust within one to two weeks, but the first several days after the change carry the highest measurable risk.
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