Weather, Night & Low Visibility
Adjust for rain, fog, darkness, and every low-visibility condition.
Conditions change the rules, and this module is about noticing how. Learn what rain, fog, snow, glare, and darkness each take away, whether traction, sight distance, or reaction time, and what the handbook expects you to add back: lower speed, longer following distance, correct light use, and earlier decisions. The pattern repeats across nearly every question here.
The rules that matter
- The road is most slippery in the first minutes of rain, when new water lifts old oil off the surface.
- Hydroplaning means your tires have left the road. Ease off the gas and hold the wheel steady — do not brake or steer sharply.
- Use low beams in fog, heavy rain, and snow. High beams reflect back off the water and make seeing worse.
- Dim your high beams within about 500 feet of an oncoming vehicle and about 300 feet when following one.
- At night, drive slowly enough to stop within the distance your headlights actually light up.
- Bridges and overpasses ice first, because they lose heat from above and below.
The lessons in this module
Each lesson is one short set of questions. If you've missed questions in this module before, a few come back at the start. Progress saves automatically; sign in only if you want cross-device sync.
Lesson videos
3 lessons · See all →Read this in the handbook
Look for these sections: Driving in Bad Weather, Night Driving.
Where these rules come from
We do not copy official handbooks — most states do not allow it. What we do instead: state the rule in our own words, then name the official document behind it. 107 questions in this module cite 19 official documents, none checked earlier than 2026-05-17. The 6 most-cited are below.
| Official document | Sections cited |
|---|---|
NHTSA Safe Driving ↗ National · Checked 2026-07-28 | 4WD/AWD Limitations, Adverse Conditions — First Rain Slickness, Adverse Conditions — Tire Tread and Hydroplaning |
State driver handbook (universal rules of the road) ↗ National · Checked 2026-06-14 | Rules of the road - visual scenario |
California Driver's Handbook ↗ State-specific · Checked 2026-07-28 | Daytime Running Lights, Emergency — Headlight Failure, Fog Driving |
California Driver's Handbook ↗ State-specific · Checked 2026-05-17 | General Driving |
Alabama Driver Manual ↗ State-specific · Checked 2026-06-08 | Low visibility and headlight use |
Arizona Driver License Manual and Customer Service Guide ↗ State-specific · Checked 2026-06-08 | Low visibility and headlight use |
Opening a source takes you to the agency's own site, never to a copy of ours. If a source is out of date or broken, say so from any question.
Practice this module
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Review these questions
If your vehicle begins to skid, you should:
- A. Steer in the direction you want the vehicle to go
- B. Shift into park
- C. Turn sharply in the opposite direction
- D. Slam on the brakes immediately
Show answer
A. Steer in the direction you want the vehicle to go — In a skid, avoid sudden braking and steer toward where you want to go. Smooth steering helps the tires regain traction.
Universal rule · checked against NHTSA Safe Driving — Skids · verified 2026-05-17
When driving at night, you should:
- A. Drive at the speed limit regardless of visibility
- B. Drive slow enough to stop within your headlight range
- C. Use interior lights to help see the road
- D. Follow closely behind another vehicle for extra light
Show answer
B. Drive slow enough to stop within your headlight range — Never overdrive your headlights. Drive at a speed where you can stop within the distance illuminated by your headlights.
Universal rule · checked against NHTSA Safe Driving — Darkness · verified 2026-05-17
What driving adjustments are needed on a gravel road?
- A. Increase speed to 'float' over the loose surface
- B. No changes — gravel roads follow the same rules as paved roads
- C. Reduce speed, increase following distance, and brake earlier and more gently
- D. Only reduce speed on curves — straight sections are safe at normal speed
Show answer
C. Reduce speed, increase following distance, and brake earlier and more gently — Gravel roads require: reduced speed (loose surface = less traction), larger following distance (dust and flying stones), earlier and gentler braking, and smoother steering. Sudden inputs on gravel can cause loss of control.
Universal rule · checked against NHTSA Safe Driving — Gravel Road Driving · verified 2026-07-28
When should you dim your vehicle's interior lights (dashboard, map lights)?
- A. Never — bright interior helps driver alertness at night
- B. Interior brightness has no effect on nighttime driving safety
- C. Turn interior lights off completely — they are distracting
- D. Keep them dim at night so your eyes stay dark-adjusted
Show answer
D. Keep them dim at night so your eyes stay dark-adjusted — Bright interior lights cause your eyes to adjust to the interior brightness, making the outside seem darker and reducing your ability to see the road. Keep interior lights dim at night to preserve night vision.
Universal rule · checked against NHTSA Safe Driving — Night Driving — Interior Lights · verified 2026-07-28
'Overdriving your headlights' means:
- A. Driving too fast to stop within the distance your headlights illuminate
- B. Using high beams when they are not needed
- C. Driving with bright lights in fog
- D. Using damaged headlights
Show answer
A. Driving too fast to stop within the distance your headlights illuminate — Overdriving your headlights occurs when you travel faster than your ability to stop within the lit area ahead. If an obstacle appears at the edge of your headlight range, you would not have enough distance to stop.
Universal rule · checked against NHTSA Safe Driving — General Driving · verified 2026-05-17