Coffee is everyone’s favorite thing around the world. Even drivers like to drink it before hitting the highway. But experts have warned that too much caffeine can be just as dangerous as fatigue while driving.
While caffeine can keep motorists alert, too much of it can have the opposite effect: impair focus, slow reactions, and even increase the risk of an accident.
Drinking too much coffee while driving is ‘risky’
Road safety groups are now warning drivers against relying too heavily on caffeine. Studies show that heavy coffee and energy drink consumers are more likely to fall than moderate users.
A 2020 research from Loughborough University found that lorry drivers who drank large amounts of caffeine reported more accidents and poorer general health.
A new survey from Carmoola estimates that 11 million UK drivers exceed the recommended 400 mg daily caffeine limit, which is equivalent to about four strong coffees.
NHS GP Dr Tim Mercer says caffeine, when used excessively, “can cause restlessness, jitteriness and anxiety.” While drinking coffee makes you more alert, too much coffee can overstimulate the nervous system, creating the illusion of being awake and reducing your concentration.
Here’s how drinking too much coffee affects your driving:
1. Making poor decisions while driving
Caffeine-induced jitters can impair judgment and focus. James Gibson of Road Safety GB warns that drivers are “relying on caffeine to combat fatigue.” But “overdoing it,” he says, “can make you restless, anxious or unable to concentrate.” The safest option you can do is to stop and rest properly.
2. Drinking too much coffee can cause tremors
Drinking too much coffee can overstimulate your nervous system. This can cause the hands or legs to tremble, making it difficult to drive smoothly or maintain control of your car.
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3. Slow response as a result of too much caffeine
Excessive caffeine consumption can cause overstimulation, which can slow your reaction time, at times when quick reactions are needed.
4. Vision and focus can be impaired if you drink too much coffee
High caffeine intake, when combined with dehydration, can cause blurred vision, shaking, or even rapid blinking, reducing your awareness.
5. Drinking too much coffee causes withdrawal headaches
Caffeine constricts the blood vessels in the brain. Although it alleviates some headaches, it worsens the headaches associated with withdrawal symptoms, which are common after prolonged, heavy use.
Experts recommend drivers monitor caffeine intake and prioritize rest. “There’s no substitute for proper sleep,” says Gibson. “Small changes like skipping late coffee or planning a rest day can make a big difference.”
Experts say moderation is the key, because staying safe on the road isn’t about more caffeine. It’s more about comfort.
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questions to ask
How much caffeine is considered too much for drivers?
Experts recommend drinking less than 400 milligrams per day, or about four cups of coffee.
Can drinking coffee make you more alert when you’re tired?
Moderate caffeine helps temporarily, but too much caffeine can cause anxiety and poor focus.
Does coffee help calm you down after alcohol?
No, caffeine only hides fatigue, it does not lower blood alcohol levels or calm you down.
What’s the safest way to stay alert on a long drive?
Get adequate rest, breaks, hydrate, and limit caffeine intake before driving.
Note to readers: This article is for informational purposes only and is not a substitute for professional medical advice. Always seek the advice of your doctor with any questions you may have about a medical condition.
