You cannot drive to Jupiter because there is no road, no air to breathe, and no vehicle that can survive the journey.

Jupiter is 484 million to 601 million miles away depending on where Earth and Jupiter are in their orbits. The fastest car ever built travels at 763 miles per hour. At that speed, the drive would take roughly 65,000 years of continuous driving without stopping for fuel, food, sleep, or repairs. Your car's engine would fail within hours. The radiation, temperature swings, and vacuum of space would destroy it when ready once it left Earth's atmosphere.

If you are asking this question because you are planning a long road trip and wondering about extreme driving safety, this article covers what actually matters: how to prepare your vehicle and yourself for extended highway driving, how fatigue affects your judgment behind the wheel, and when to stop driving instead of pushing through.

Key Takeaways

  • Long-distance driving becomes unsafe after about 8 to 10 hours in a single day because fatigue impairs your reaction time as much as alcohol does.
  • Your vehicle needs a pre-trip inspection covering brakes, tires, fluids, and lights before any drive over 500 miles.
  • Stopping every 2 hours or every 100 miles gives your body and mind time to reset and reduces the risk of falling asleep at the wheel.
  • Driving through the night is riskier than driving during the day, even if you feel alert, because your circadian rhythm works against you regardless of how much sleep you got.

How fatigue changes what your body can do behind the wheel

Driving tired is not the same as driving slowly. When you have been awake for 18 hours, your reaction time matches that of someone with a blood alcohol level of 0.05 percent — legally sober but measurably impaired. At 24 hours awake, you are as impaired as someone at 0.10 percent, over the legal limit in every state.

The danger is that you do not feel as impaired as you actually are. Your brain stops sending accurate signals about how tired you are. You might feel fine for the last 50 miles of a 300-mile drive, then drift into another lane or miss a red light because your eyes closed for a second. That second is enough.

Caffeine and energy drinks delay fatigue but do not remove it. They mask the feeling while the impairment continues underneath. Pulling over for a 20-minute nap works better than coffee because it actually reduces impairment, though even a short nap is not a substitute for real sleep.

The vehicle inspection you need before a long drive

A long drive stresses your vehicle in ways a commute does not. You are running the engine continuously, the brakes work harder on highway descents, tires heat up and wear faster, and you are far from a mechanic if something fails.

Before any drive over 500 miles, check these four things yourself or have a mechanic check them:

  • Tires: Measure tread depth with a penny (insert it upside down into the tread; if you can see the top of Lincoln's head, the tread is too worn). Check pressure when the tires are cold, before you drive. Underinflated tires overheat and can fail at highway speeds.
  • Brakes: Listen for squealing or grinding. Feel for a soft or spongy brake pedal. If either is present, have the brakes inspected before you leave.
  • Fluids: Check engine oil, coolant, brake fluid, and windshield washer fluid. Top off anything low. Bring extra oil and coolant in the car.
  • Lights: Test headlights, taillights, brake lights, and turn signals. Replace any bulb that is out.

Bring a spare tire, a jack, jumper cables, a flashlight, and basic tools. If you have an older vehicle or one with high mileage, have a full inspection at a shop before you go.

When to stop driving instead of pushing through

The rule most people break is the 2-hour stop rule. Drive for 2 hours, stop for 15 to 20 minutes. Get out of the car, walk around, use the bathroom, drink water. This is not a suggestion — it is the point at which fatigue begins to override your ability to stay alert.

Some people try to extend this by switching drivers. Switching drivers helps, but it does not eliminate fatigue. Both drivers still need breaks. If you are driving with another person, plan to stop every 2 hours regardless of who is behind the wheel.

Driving through the night is riskier than driving during the day, even if you slept well the night before. Your circadian rhythm — your body's internal clock — makes you drowsy between 2 a.m. and 6 a.m. and again between 2 p.m. and 4 p.m., regardless of how much sleep you have had. If you must drive at night, stop more often, not less.

How to set up your car for comfort on a long drive

Discomfort accelerates fatigue. A seat that does not support your lower back, a steering wheel that is too far away, or a windshield that glares will tire you faster than the miles themselves.

Adjust your seat before you leave so your back is supported and your arms are slightly bent when holding the wheel. Bring a small pillow or lumbar support if your car seat does not have one. Keep the cabin temperature cool — a warm car makes you drowsy. Use air conditioning or crack the windows rather than letting the car get hot.

Bring water and snacks that do not require much attention: nuts, fruit, crackers. Avoid heavy meals before driving because digestion pulls blood away from your brain. Do not rely on snacking to stay awake — it will not work once real fatigue sets in.

What to pack for a safe long-distance drive

Beyond the vehicle supplies, pack these items in your car:

  • Phone charger and a portable battery pack
  • A paper map or written directions (in case your phone dies)
  • Medications you take regularly, plus any over-the-counter pain relievers or antacids
  • Sunglasses and a hat to reduce glare and eye strain
  • A change of clothes and toiletries in case you need to stay overnight unexpectedly
  • Cash and a credit card (gas stations in remote areas may not accept all cards)

Tell someone where you are going and when you expect to arrive. Text or call them when you reach your destination. If you break down, stay with your vehicle — it is easier to spot than a person walking along the road.

Frequently Asked Questions

How many hours can I safely drive in one day?

Most people can safely drive 8 to 10 hours in a single day if they stop every 2 hours and get a full night of sleep before and after. Beyond 10 hours, fatigue impairment increases sharply. If your trip requires more than 10 hours of driving, split it across two days.

Is it better to drive at night to avoid traffic?

No. While traffic is lighter at night, your body's circadian rhythm makes you drowsy between 2 a.m. and 6 a.m. regardless of how alert you feel. Daytime driving with traffic is safer than nighttime driving without it. If you must drive at night, stop more frequently and consider waiting until morning.

Can I take a prescription stimulant to stay awake on a long drive?

No. Prescription stimulants mask fatigue but do not remove impairment, and they can cause jitteriness, poor judgment, or a crash when they wear off. The only real solution to fatigue is sleep. If you are too tired to drive safely, stop and sleep.

What should I do if I start to feel drowsy while driving?

Pull over when ready at a safe location — a rest stop, gas station, or parking lot. Do not try to push through. A 20-minute nap will reduce impairment more than any amount of coffee. If you are far from a safe place to stop, open the windows, turn up the music, and pinch your arm, but get off the road as soon as you can.

Do I need to tell my insurance company about a long road trip?

No. Your auto insurance covers you on any legal road in the United States. You do not need to notify your insurer before a long drive. However, if you are driving to a different state and plan to stay there for more than a few months, you may need to update your address with your insurance company.