When to Use High Beams (and When They Get You a Ticket)

Most new drivers make one of two mistakes at night. Some never touch the high beams, creeping down unlit country roads with half the light their car can make. Others forget to switch them off and blind every driver coming the other way. Knowing when to use high beams is partly a test fact with specific distances, and partly a real night-driving skill. This guide covers both.

When to use high beams

High beams light the road much farther ahead than low beams, which matters because at night you can only react to what you can see. Use them when:

• You're on a dark road with no streetlights, such as rural highways and back roads.
• There's no oncoming vehicle close enough to be blinded.
• You aren't following another vehicle closely.
• The weather is clear: no fog, heavy rain or falling snow.

Switch back to low beams in cities and well-lit areas, where high beams add glare without helping you see. On a dark road with intermittent traffic, you'll toggle back and forth often. That's normal.

When to dim: oncoming and following distances

Here are the numbers permit tests ask about. Many state driver manuals use these:

Some states use a slightly different following distance, so check your own driver manual before test day. The logic is the same everywhere: dim early enough that your lights never shine into another driver's eyes, either through their windshield or bouncing off their rear-view mirror.

How far is 500 feet? A bit more than one and a half football fields. Out on the road, the practical cue is simple: when you see headlights appear ahead, dim. Don't wait until they're close.

When oncoming drivers don't dim

If someone approaches with their brights on, don't retaliate by flashing yours. Two blinded drivers are worse than one. Instead:

• Look toward the right edge of your lane, using the white edge line as a guide.
• Slow down slightly until they pass.
• Keep your low beams on.

Overdriving your headlights

"Overdriving your headlights" means driving so fast that your stopping distance is longer than the distance your lights reveal. If a deer, a stalled car or a pedestrian appears at the edge of your beam, you can't stop in time.

This is the main reason high beams matter on dark roads: they extend your sight distance. But even with high beams, speeds that feel easy during the day can be too fast at night. Speed limits are set for typical conditions, and darkness isn't typical. Our guide to the basic speed law explains why the legal speed is the safe speed for conditions, not just the number on the sign.

A good test: pick an object as soon as it enters your headlights and count. If you reach it in less time than you'd need to stop, slow down.

Handling glare

Glare comes from oncoming headlights, from cars behind you, and from a dirty windshield. You can reduce all three:

• Keep glass clean, inside and out. A film on the inside of the windshield scatters light badly at night.
• Flip the rear-view mirror to night mode. The tab under most manual mirrors tilts it to cut glare from cars behind you; many cars auto-dim.
• Dim your dashboard lights. A bright dash makes it harder for your eyes to adjust to the road.
• Look away from bright lights, toward the right edge of your lane.
• Don't wear tinted glasses at night, even ones sold as "night driving" lenses.

After a bright car passes, your eyes need a moment to readjust. Be extra careful in those few seconds.

Fog, rain and snow: why low beams

This is the most counterintuitive rule, and it's a classic test question. In fog, heavy rain or snow, use low beams, not high beams.

High beams shine up and out, so the light hits millions of water droplets or snowflakes and reflects straight back at you. It's like turning on a flashlight in a steamy bathroom. Low beams aim down at the road, so less light bounces into your eyes. If your car has fog lights, use them as your manual and state law allow.

In poor visibility, also slow down and increase your following distance. If you're caught in heavy rain, our guide on what to do if you hydroplane covers how to keep your tires gripping the road.

Drowsy driving at night

Night driving is riskier for several reasons at once: you see less, other drivers may be impaired or tired, and your own body wants to sleep. NHTSA's drowsy driving page lists the warning signs: frequent yawning or blinking, trouble remembering the last few miles, missing your exit, and drifting from your lane.

What works:

• Get enough sleep before a night drive, especially a long one.
• Share the driving or plan stops.
• Pull over somewhere safe for a short nap if you're fading.

What doesn't work: opening the window, turning up the music or relying on coffee alone. They may help briefly, but they don't replace sleep.

For teen drivers, many states restrict late-night driving in the early license stages for exactly these reasons. Check your state's rules before planning night practice.

Night driving checklist for practice drives

• Headlights aimed correctly and both working
• High-beam indicator understood
• Windshield clean inside and out
• Mirrors adjusted and night mode tested
• Route planned, including where it's unlit
• Supervising driver awake and alert

Practice in stages: start on familiar streets at dusk, then move to darker roads where you'll get real high-beam practice. When you're ready to review the numbers that show up on the test, keep our permit test cheat sheet handy and try our free practice tests. Knowing when to use high beams, and when not to, earns easy points there and keeps you safe after dark.

Frequently asked questions

When must you dim your high beams?

In many states, you must dim within 500 feet of an oncoming vehicle and within 300 feet of a vehicle you're following. Check your state's driver manual for its exact distances.

Should you use high beams in fog?

No. High beams reflect off fog, rain and snow and make it harder to see. Use low beams, and fog lights if your car has them.

Why is night driving more dangerous?

You can see less and react later, glare reduces your vision, and fatigue and impaired drivers are more common at night. Slowing down and staying alert helps offset those risks.