Check these four things before you leave
Whether it's safe to drive right now depends on your vehicle's condition, the weather, the road surface, and your own state. You can't control the weather, but you can control the other three—and you should check them before you turn the key. A vehicle with failing brakes or bald tires isn't safe in any conditions. Rain or snow that you could handle in a well-maintained car becomes genuinely dangerous in one that isn't.
The safest choice is often not to drive. If you're tired, medicated, or impaired in any way, stay home. If your vehicle has a warning light on, especially the brake light or check engine light, get it looked at before you go anywhere. If the weather is severe enough that you're asking the question, the answer is usually no.
Key Takeaways
- Before driving in bad weather, check your tire tread depth, brake responsiveness, and wiper blade condition—these are the systems that keep you on the road.
- Rain reduces traction and visibility; snow and ice make both nearly impossible unless your vehicle is in top condition and you're driving well below the speed limit.
- Fatigue, medication, and any level of impairment make you unsafe regardless of conditions, and no trip is worth that risk.
- If your vehicle is showing warning lights or has known mechanical problems, postpone the trip rather than gamble with your safety and others'.
Tire condition is your first checkpoint
Your tires are the only thing between your car and the road. In wet or slippery conditions, bald or worn tires will lose grip and you'll hydroplane or slide. Check your tread depth with the penny test: insert a penny into the tread with Lincoln's head upside down. If you can see the top of his head, your tread is too shallow and you should not drive in rain or snow.
In dry conditions, you might get away with shallow tread for a short distance. In wet conditions, you're taking a real risk. In snow or ice, shallow tires are genuinely dangerous—you'll lose control on any hill or curve. If you're not sure about your tires, assume they're not safe for the conditions you're facing and find another way to get where you need to go.
Brakes and visibility matter more in bad weather
Test your brakes before you leave the driveway. Press the pedal firmly and feel for a solid response. If the pedal goes soft, sinks to the floor, or feels spongy, your brakes are compromised and you should not drive. A brake warning light on your dashboard means the same thing—get the vehicle serviced before you go anywhere.
Check your wipers and washer fluid. If your wipers are streaking, chattering, or leaving dry spots, replace the blades before you drive in rain. In heavy rain or snow, you need to see the road clearly. Worn wipers that leave you guessing about what's ahead are a hazard. Make sure your headlights and taillights work too—other drivers need to see you, and you need to see the road.
Rain, snow, and ice each demand different judgment
Heavy rain reduces your traction and visibility. Hydroplaning—where your tires lose contact with the wet road—can happen at speeds as low as 35 mph if your tread is worn or the water is deep. If it's raining hard enough that you can't see clearly or you're uncomfortable with your grip on the road, don't drive. If you must drive in rain, slow down, increase your following distance to at least eight seconds behind the car ahead, and avoid sudden braking or sharp turns.
Snow and ice are a different category of danger. If there's snow or ice on the road, you should not drive unless your vehicle has winter tires and you're prepared to drive slowly—often 20 to 30 mph below the posted limit. All-season tires lose grip in snow. Regular tires on ice are nearly useless. If you don't have winter tires and the roads are snow-covered or icy, stay home. No appointment is worth sliding into another car or a ditch.
Black ice—a thin, nearly invisible layer of ice on the pavement—is especially dangerous because you won't see it until you're already skidding. If the temperature is near freezing and the road looks wet but you haven't seen salt trucks, assume there's black ice and don't drive.
Your own condition is as important as the vehicle
If you're tired, don't drive. Fatigue slows your reaction time as much as alcohol does. If you've taken medication that makes you drowsy, don't drive. If you've had any alcohol or drugs, don't drive—not even a little. Your judgment about whether you're impaired is the worst measure of whether you actually are. If you're asking yourself whether you're okay to drive, you're probably not.
Illness, pain, or strong emotion can also affect your ability to drive safely. A migraine, a bad cold, or grief can all distract you or slow your reactions. If you're not at your best, find another way to get where you need to go or wait until you feel better.
Warning lights and known problems mean don't drive
Your dashboard warning lights exist for a reason. A check engine light might mean something minor, but it might mean your engine is misfiring or your emissions system is failing. A brake light means your brakes need attention. An ABS light means your anti-lock brake system is offline. An oil pressure light means your engine isn't getting lubricated properly. None of these are safe to ignore.
If you know your vehicle has a problem—a grinding noise when you brake, a steering wheel that pulls to one side, a transmission that hesitates—don't drive it in bad weather and don't drive it far. Get it to a shop. A vehicle with a known mechanical problem is unpredictable, and unpredictable is unsafe.
When to postpone or find another way
The safest decision is often to not drive. If the weather is severe, if you're not feeling well, if your vehicle isn't in good shape, or if you're tired, postpone the trip. Call ahead and explain. Most people understand. If you absolutely must get somewhere, consider alternatives: ask someone else to drive, use a rideshare service, take public transit, or wait for the weather to improve.
The cost of postponing a trip is usually small. The cost of an accident—injury, death, property damage, insurance rates, legal liability—is enormous. When you're unsure, the safe choice is to wait.
Frequently Asked Questions
How fast can I safely drive in rain?
Reduce your speed to whatever feels controlled and stable. For most drivers in moderate rain, that's 10 to 15 mph slower than the posted limit. In heavy rain, go slower. If you're hydroplaning or sliding, you're going too fast for the conditions. Increase your following distance to at least eight seconds behind the car ahead so you have time to react.
Do I need winter tires if I only drive occasionally in snow?
Winter tires make a significant difference in snow and ice, even for occasional driving. All-season tires lose grip below 45 degrees Fahrenheit. If you live somewhere that gets snow, winter tires are worth the cost. If you only drive occasionally in snow, you could also choose not to drive when roads are snow-covered or icy—that's the safest option.
What should I do if I start to skid?
Stay calm and don't brake hard. If you're skidding, ease off the accelerator and steer in the direction you want the front of the car to go. Let the car straighten itself out. If you have anti-lock brakes, explore steady pressure to the brake pedal. If you don't, pump the brakes gently. Once you regain control, drive slowly and carefully to your destination or pull over safely.
Is it safe to drive with a check engine light on?
It depends on what's causing it. A loose gas cap might trigger the light and pose no safety risk. A misfiring engine or failing emissions system is more serious. You can drive to a shop to have it diagnosed, but don't take a long trip or drive in bad weather until you know what the problem is. If the light is flashing rather than steady, pull over and have the vehicle towed.
How do I know if my brakes are failing?
A soft or spongy brake pedal, a pedal that sinks to the floor, a grinding or squealing noise, or a brake warning light all mean your brakes need attention. If your brakes feel wrong, don't drive. Have the vehicle towed to a shop or call a mobile mechanic. Brake failure is a serious safety issue and not something to ignore or drive on.