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.
Read this in the handbook
Start with the handbook sections that match this module, then come back for sample questions and drills.
Practice weather, night & low visibility questions
In heavy rain, you should:
- A. Use high beam headlights
- B. Stay close to the vehicle ahead
- C. Drive at the speed limit
- D. Increase your following distance
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D. Increase your following distance — Wet roads require longer stopping distances. Increase your following distance to at least 4-6 seconds in heavy rain.
When sand or gravel appears on a paved road surface, what is the hazard?
- A. It improves traction like rough pavement
- B. Only a hazard for motorcycles
- C. Loose material significantly reduces friction, especially in turns and braking — treat it like ice
- D. Only dangerous above 45 mph
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C. Loose material significantly reduces friction, especially in turns and braking — treat it like ice — Sand, gravel, or other loose material on pavement dramatically reduces traction - potentially to near-zero. Treat it as you would ice: slow down before reaching the material, avoid sudden steering or braking inputs, and proceed carefully.
When should you switch from high beams to low beams?
- A. Only when a police officer is nearby
- B. Only when entering a city when applicable to your jurisdiction
- C. When another vehicle is within 1,000 feet approaching you, or within 300 feet when following another vehicle
- D. High beams are always preferable for best visibility
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C. When another vehicle is within 1,000 feet approaching you, or within 300 feet when following another vehicle — Switch to low beams when within 500 feet of an oncoming vehicle (some states require 1,000 feet) and within 300 feet when following another vehicle, to avoid blinding other drivers.
After driving at night, your eyes need how long to fully readjust to daylight?
- A. About 5 minutes in most driving situations
- B. Immediately — daylight readjustment is nearly instant
- C. 30 minutes — the same as dark adaptation
- D. About 7-10 seconds for initial adjustment, with full daylight sensitivity restored quickly — much faster than dark adaptation
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D. About 7-10 seconds for initial adjustment, with full daylight sensitivity restored quickly — much faster than dark adaptation — Light adaptation (adjusting from dark to light) is much faster than dark adaptation — typically a few seconds to 30 seconds. Dark adaptation (from light to dark) takes 20-30 minutes for full sensitivity. This explains why exiting a tunnel temporarily blinds you.
In heavy fog, which action makes you most visible to other drivers?
- A. Using high beams — they project further to maintain safe operating conditions
- B. Using only your running lights to minimize glare
- C. Flashing your lights periodically to signal your presence
- D. Turning on your low beams and rear fog lights (if equipped) — fog reflects high beams and reduces your visibility
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D. Turning on your low beams and rear fog lights (if equipped) — fog reflects high beams and reduces your visibility — In fog: use low beams (not high beams, which reflect off fog droplets) and rear fog lights if your vehicle has them. Rear fog lights make you much more visible from behind.
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