Why should a person avoid driving when dehydrated?
Dehydration directly affects brain function and muscle performance. A dehydrated driver may drift between lanes, react more slowly to hazards, or miss important signs, which can put them and others at risk. A 2024 Behavioural Science & Digital Health trial showed that drivers who are dehydrated have 40% slower reaction times and 50% more missed cues than well-hydrated drivers.