Every March, California drivers adjust their clocks for daylight saving time, but data shows the roads don’t adjust as quickly. Losing just one hour of sleep may seem minor, yet studies consistently reveal a measurable rise in accidents immediately after the switch.

According to multiple research sources, fatal car crashes increase by 6–8% during the week following the spring DST change. This spike has been repeatedly documented across more than two decades of traffic data.

Let’s break down why this happens and how you can stay safe on the road this week.

Why Are There More Crashes After Daylight Saving Time?

1. Sleep Disruption

The one‑hour shift disrupts the body’s internal clock, often taking 4–5 days to fully adjust, according to sleep specialists. Sleep deprivation reduces reaction time, slows decision‑making, and increases the risk of microsleep, all dangerous behind the wheel.

2. Driver Fatigue

Drowsiness is a major contributor to crash risk. Research comparing drowsy driving to drunk driving shows both impair judgment and reduce attentiveness. After DST, drivers feel more fatigued, which directly correlates with the spike in crash rates

3. Reduced Morning Visibility

More than half of deadly crashes already occur after dark, and DST shifts mean many Californians are suddenly commuting before sunrise. This combination of darkness and sleep loss is a dangerous mix.

Key Statistics California Drivers Need to Know

• Fatal crashes rise 6–8% in the week after DST, based on long‑term national studies and recent reporting.
• University of Colorado research analyzing over 732,000 accidents found a consistent 6% spike in fatal crashes after “spring forward.”
• Drowsy driving risk increases immediately following the time change, contributing to more collisions.

These trends have prompted several states, including California, to explore ending DST entirely. But until laws change, drivers need to be extra vigilant during this high‑risk week.

What California Drivers Can Do to Stay Safe This Week

✔️ Get extra rest. Prioritize sleep for several days before and after the time change.
✔️ Leave earlier. Give yourself time for slower, more cautious driving.
✔️ Avoid distractions. Phones, screens, and multitasking are especially dangerous when you’re tired.
✔️ Use headlights proactively. Dawn lighting is dimmer than it appears.

Small adjustments can prevent serious accidents, and even save lives.

Common Questions About Daylight Saving Time & Car Accidents

Is the increase in crashes after DST really that significant?

Yes. Multiple long‑term studies show a 6–8% rise in fatal crashes in the week after the time change. Even minor sleep loss drastically affects reaction time and driving performance.

Does the fall time change (“fall back”) cause the same dangers?

No. Research shows the spring forward shift is far more dangerous because it results in sleep loss, whereas the fall shift gives drivers an extra hour of rest.

Can fatigue-related crashes be considered negligence in a legal case?

Potentially, yes. If a driver knew they were unfit to drive — including being extremely fatigued — they may still be held legally responsible for causing a collision.

What if I was injured in an accident during the DST week?

The time of year does not reduce your right to compensation. If another driver’s negligence caused your injuries, you may be entitled to medical costs, lost wages, pain and suffering, and more.

How soon should I talk to an attorney after a crash?

 As soon as possible. Early legal guidance helps protect your rights, preserve evidence, and prevent insurance companies from minimizing your claim.

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If You’ve Been Injured in a Crash, We’re Here to Help

If you or a loved one was injured due to someone else’s negligence especially during this statistically dangerous DST transition you don’t have to navigate it alone. Our team of specialists will be more than happy to assist you during this hard time. 

📞 Call us now for a FREE consultation (323) 515-1928
💻 Visit: EstradaLawGroup.com

📞 Estrada Law Group — Personal Injury Attorneys You Can Trust

You deserve answers, support, and strong legal representation. We’re here to help you recover physically, emotionally, and financially.

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‍Legal Disclaimer

The information provided in this blog is for general informational purposes only and does not constitute legal advice. Reading this article does not create an attorney‑client relationship with Estrada Law Group or any of its attorneys. Every case is unique, and you should consult with a qualified personal injury attorney about your specific situation. If you have been injured or believe you may have a legal claim, contact our office directly for a personalized evaluation.

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