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Driver fatigue and continuous driving hours

Once you've been behind the wheel for more than 2 hours without a break, your crash risk climbs sharply, and drowsiness shows up in 20-25% of severe highway accidents. Brazilian law (CTB and Law 13.103/2015 for professional drivers) requires a break every 5 h 30 min of continuous driving. Consider microsleep, when your eyes close for about 4 seconds: at 100 km/h that's 110 metres driven blind. A few habits help. Stop every 2 h. Have coffee if you want, but don't lean on it, because the crash afterward is worse. Get 7-8 h of sleep the night before. And steer clear of the road between 2-5 AM, when biological alertness bottoms out. As a rough guide, a 6-hour drive should include at least 2 stops of 15-30 minutes.

Applications

Useful when you're mapping out a long road trip, managing shifts for ride-hailing drivers, running ANTT-regulated trucking and intercity bus operations, setting fleet safety policies, or sorting out the drive home after a family vacation.

FAQ

Does coffee actually fight fatigue? Caffeine blocks adenosine receptors for around 3-4 hours, and it works best paired with a 15-20 min nap (the "coffee nap"). What it won't do is replace sleep.

Why is 2-5 AM the worst window? That's when the circadian rhythm drives core body temperature and alertness down to their daily low. Even a well-rested driver ends up with reaction times on par with the legal alcohol limits.

What about the 5h30 limit? That one is for professional drivers (Lei 13.103/2015), and it comes with a mandatory 30-minute break. Private drivers face no legal cap, but the 2-hour rule is still worth following for safety.