Driving With a Cold: Is It as Dangerous as Drunk Driving?
TL;DR: Driving with a heavy cold can impair your concentration and reaction times to the same degree as consuming four double whiskeys, according to a study by a UK car insurance company and a British university. Cold medicines, sleep loss, and symptoms like fever and coughing all make it worse. If you feel unwell, you should seriously reconsider getting behind the wheel.
Can You Drive With a Cold?
You can legally drive with a cold, but a heavy cold can impair your ability to drive safely by reducing your concentration and slowing your reaction times to a degree comparable to alcohol impairment. A study by a UK car insurance company and a British university found that drivers suffering from heavy colds showed impairment similar to someone who had consumed four double whiskeys. That is not a minor inconvenience. That is a genuine road safety risk for you and everyone around you.
The key word is heavy. A mild sniffle is very different from a full-blown cold with fatigue, fever, and head congestion. You need to honestly assess how you feel before you put the key in the ignition.
Is It Safe to Drive When You Have a Cold?
Driving with a cold is not safe when your symptoms are heavy because the combination of sleep deprivation, reduced alertness, and slower reaction times creates real crash risk. Cold symptoms like headache, stuffy nose, cough, and fever all work against the focus and quick decision-making that safe driving requires. These effects mirror what alcohol does to your brain and body.
Sleep deprivation is one of the biggest factors. When you are sick, aches, pains, coughing, and sneezing disrupt your sleep at night. That exhaustion carries directly into your daytime driving. Drowsy driving and impaired driving share many of the same dangers.
If you feel your symptoms are heavy, wait until they subside before starting any long trip. If you must drive, stay focused, avoid distractions, and keep extra following distance from the car ahead of you.
Can I Drive With a Cough?
A persistent cough while driving creates a real hazard because repeated coughing fits pull your attention away from the road, cause your eyes to close briefly, and can jerk your hands on the steering wheel. Even a single forceful coughing fit at highway speed can cause you to drift out of your lane. If your cough is severe or comes in prolonged fits, it is not safe to drive.
Nighttime coughing also destroys sleep quality, which means you may be getting behind the wheel the next morning already running on inadequate rest. A tired driver with a cough is a dangerous driver.
How Many Americans Drive Each Day With a Cold?
It is estimated that close to 1 million vehicles on U.S. roads each day are operated by someone suffering from cold symptoms. This number comes from combining two facts: there are roughly 500 million colds in the United States every year, and approximately 90 percent of Americans drive every day. When you do the math, the scale of the problem becomes clear. The chances of a cold-sufferer being involved in a serious accident are high.
What Effect Can Cold Medicine Have on a Driver?
Cold medicine can make you drowsy, slow your reaction time, and impair your judgment, sometimes significantly, because many over-the-counter cold remedies contain antihistamines and some contain up to 27 percent alcohol. Antihistamines are well known for causing sedation. When you combine that sedation with the fatigue already caused by your illness, the result can be serious impairment behind the wheel.
Always read the label of any cold remedy before driving. If the label warns against operating heavy machinery, that warning applies directly to your car. When in doubt, do not drive after taking cold medicine until you know how it affects you personally.
Which Health Conditions Can Affect Your Driving?
A cold, an infection, a virus, and all similar illnesses can negatively affect your driving because they share common effects: reduced concentration, slower reaction times, fatigue, and physical discomfort that diverts your attention. The correct answer to that common driver safety question is all of these.
Any illness that disrupts your sleep, causes fever, or makes you reach for sedating medication can put you and others at risk on the road. This is not limited to colds. Flu, sinus infections, and other respiratory viruses carry the same risks.
Is It Safe to Drive With a Fever?
It is not safe to drive with a fever because fever impairs cognitive function, causes confusion and disorientation, slows reaction times, and can make you feel suddenly worse without warning. A fever is your body working hard to fight an infection, and that physical stress diverts mental resources away from the focus driving demands.
Even a low-grade fever can make you feel foggy and unpredictable behind the wheel. A high fever makes driving genuinely dangerous. You should not drive with a fever until it has fully broken and you feel alert and in control.
Can You Drive With a Fever?
You can physically get into a car with a fever, but doing so is a serious risk to your safety and the safety of others on the road. A fever reduces mental clarity, causes physical weakness, and can make you feel disoriented. These effects are incompatible with the demands of safe driving. Wait until your fever has broken completely before driving.
Should You Drive When You Are Ill?
You should only drive when ill if you feel genuinely well enough to safely operate your vehicle, because illness can impair your reaction time, concentration, and judgment in ways similar to alcohol impairment. If there is any doubt, the safer answer is to wait. Arrange an alternative, ask someone else to drive, or delay your trip until you recover.
If you do choose to drive while sick, take these steps seriously:
- Focus only on the task of driving. Eliminate all distractions.
- Keep a greater following distance than usual from vehicles ahead of you.
- Do not take sedating cold medicine before driving.
- Avoid long trips until your symptoms have fully subsided.
- Pull over safely if you feel a coughing or sneezing fit coming on.
How Does Driving With a Cold Compare to Drunk Driving?
The impairment caused by driving with a heavy cold closely mirrors the impairment caused by alcohol. Here is a direct comparison of the key effects based on the source research:
| Impairment Factor | Heavy Cold | Four Double Whiskeys |
|---|---|---|
| Concentration | Significantly reduced | Significantly reduced |
| Reaction time | Slowed | Slowed |
| Alertness | Reduced by fatigue and symptoms | Reduced by sedative effect of alcohol |
| Sleep deprivation contribution | High (disrupted sleep from symptoms) | Moderate (alcohol disrupts sleep quality) |
| Medication risk | Yes (antihistamines, up to 27% alcohol in some remedies) | N/A |
| Legal status while driving | Legal but potentially negligent | Illegal above legal limit |
The legal difference matters in a courtroom, but the physical reality on the road is strikingly similar. A driver impaired by a heavy cold can be just as dangerous as a drunk driver.
Quick Recap
- Driving with a heavy cold can impair you as much as consuming four double whiskeys, according to research from a UK car insurance company and a British university.
- Cold symptoms alone are not the only problem. Sleep deprivation from nighttime coughing, sneezing, and aches is a major cause of impairment.
- Many cold medicines contain antihistamines and some contain up to 27 percent alcohol, both of which increase drowsiness.
- An estimated 1 million vehicles per day in the U.S. are driven by someone with a cold, based on 500 million annual colds and 90 percent of Americans driving daily.
- A cold, a fever, a virus, and an infection can all negatively affect your driving ability.
- Driving with a fever is especially risky because it impairs cognitive function and can cause disorientation.
- You should only drive when sick if you honestly feel capable of doing so safely. When in doubt, do not drive.
- In Michigan, one person is killed every 9.4 hours and one person is injured every 7.5 hours in crashes, based on the State of Michigan Office of Highway Safety Planning data from reported crashes.
Frequently Asked Questions
Does having a cold count as distracted driving in Michigan?
Michigan law does not specifically classify driving with a cold as distracted driving, but a driver who causes a crash while knowingly impaired by illness could face negligence claims. If your illness-related impairment contributed to a serious accident, an attorney can evaluate your legal options.
Can cold medicine cause a DUI in Michigan?
Yes, Michigan law allows for DUI charges based on any substance that substantially impairs your ability to drive, including over-the-counter medications. Some cold remedies contain up to 27 percent alcohol. If an officer determines your driving is impaired, the source of that impairment does not have to be illegal drugs or alcohol.
What cold symptoms are most dangerous for driving?
Fever, extreme fatigue from poor sleep, and prolonged coughing or sneezing fits are the most dangerous cold symptoms for drivers. These directly impair concentration, reaction time, and physical control of the vehicle.
How long should I wait to drive after a cold?
You should wait until your fever has fully broken, your coughing fits are manageable, and you feel mentally alert. There is no fixed number of days. Your honest self-assessment of how you feel is the best guide. Do not start a long road trip until symptoms have clearly subsided.
If a sick driver caused my accident in Michigan, can I file a claim?
Yes. If a driver who was impaired by illness caused your accident and your injuries, you may have grounds for a personal injury claim. Michigan accident victims dealing with serious injuries deserve experienced legal representation. The team at Hanflik Law handles complex cases involving catastrophic injuries, wrongful death, and significant damages throughout Michigan.
Is drowsy driving as dangerous as drunk driving?
Research consistently shows that drowsy driving impairs reaction time, concentration, and decision-making in ways very similar to alcohol impairment. Since a heavy cold causes significant sleep deprivation, sick drivers often experience both illness-related impairment and drowsy driving simultaneously.
What should I do if I was seriously injured by an impaired driver in Michigan?
Seek medical attention first, document everything you can at the scene, and contact an experienced Michigan personal injury attorney as soon as possible. Evidence in serious crash cases can disappear quickly. An attorney can investigate the driver’s condition at the time of the crash and build the strongest possible case on your behalf.
Serious accidents can change your life in an instant. At Hanflik Law, we understand that the physical, emotional, and financial consequences of a major injury are devastating. We will not charge you anything until we win or resolve your case. If you or a loved one has been injured in an accident anywhere in Michigan, Call for a FREE Consultation 810-720-4000.