Bad Weather & Night Driving — Missouri
Missouri CDL practice test: 413 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Bad Weather & Night Driving: 22 questions.
Rain, snow, ice, fog and night driving: visibility, traction and headlight use.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Bad Weather & Night Driving |
| License test | Missouri CDL permit (CLP) knowledge tests |
| Topic questions | 22 (5% of 413 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
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Questions (22)
1. Hydroplaning happens most often when:
- A vehicle is traveling faster than 60 mph.
- Tire pressure is too low. ✓
- Tire tread is too deep.
Answer: B. Tire pressure is too low.
Hydroplaning happens most often when tire pressure is too low. The handbook says low tire pressure makes hydroplaning more likely, and worn tread does too. It explains that tire grooves carry water away, so grooves that are not deep enough do not clear the water well. The same passage also says hydroplaning can happen even at 30 mph when there is a lot of water, so the key setup is low pressure or worn tread, not simply a high speed.
2. ____ is a thin layer of ice that forms on road surfaces.
- White ice
- Black ice ✓
- Green ice
Answer: B. Black ice
Black ice is a thin layer of ice that forms on road surfaces. The handbook describes black ice as a thin layer that is clear enough for you to see the road underneath it, so the road looks wet. It warns that any time the temperature is below freezing and the road looks wet, you should watch for black ice. The same section says that on an icy surface you should slow to a crawl and stop driving as soon as you can safely do so.
3. When it’s difficult to see, such as at dawn or dusk, a driver can increase their vehicle's visibility by:
- Driving while using their lights. ✓
- Driving with their windows open.
- Flashing their lights periodically.
Answer: A. Driving while using their lights.
When it is hard to see, such as at dawn or dusk, you should drive with your lights on to make your vehicle easier for others to see. The handbook's section on communicating your presence says that at dawn, dusk, in rain or snow you need to make yourself easier to see, because if you have trouble seeing other vehicles, other drivers have the same trouble seeing you. It tells you to turn on your lights — the headlights, not just the identification or clearance lights — and to use low beams, since high beams can bother people in daytime as well as at night.
4. If unable to tell if the road is becoming icy and slippery, a driver:
- Should try guessing.
- May open their window and feel the front of the side mirror for ice. ✓
- Should look at the road closely.
Answer: B. May open their window and feel the front of the side mirror for ice.
Open your window and feel the front of the side mirror for ice; that is the handbook's simple check when you cannot tell whether the road is icing up. The Texas CDL handbook says it can be hard to know when a road is slippery, so it gives signs to check. One easy check is to open the window and feel the front of the mirror, mirror support, or antenna. If ice is there, the road surface is probably starting to ice up. A later section also tells drivers to check mirrors and wiper blades for ice and treat the road as likely icy if they find it. That supports using the mirror as a practical ice detector rather than guessing.
5. In cool weather, as the temperature begins to rise and ice begins to melt:
- It is usually safe to drive.
- The road will become even more slippery. ✓
- Traction will increase.
Answer: B. The road will become even more slippery.
The road will become even more slippery as ice begins to melt. The handbook warns that when the temperature rises to the point where ice starts to melt, the road becomes even more slippery, so you should slow down more. It also explains that slight melting makes ice wet, and wet ice is much more slippery than ice that is not wet. That means melting ice does not make driving safer or improve traction; it makes the surface harder to handle, so you need to reduce speed and drive smoothly.
6. Shaded areas of a road:
- Usually don’t freeze.
- Are usually blocked from all moisture, so they cannot freeze.
- Will remain slick after ice has melted on other areas of the road. ✓
Answer: C. Will remain slick after ice has melted on other areas of the road.
Shaded areas of the road will remain slick after ice has melted on other areas. The handbook lists shady areas as one sign of a slippery road. It explains that these parts stay icy and slick well after exposed sections have thawed. That is why a shaded stretch can still be dangerous even when the rest of the road looks clear. The answer that says shaded areas stay slick after ice elsewhere has melted matches that warning.
7. Water that has collected on a roadway can cause:
- Hydroplaning. ✓
- Acceleration.
- Stopping.
Answer: A. Hydroplaning.
Water collected on a roadway can cause hydroplaning. When water or slush collects on the road, the handbook says your vehicle can hydroplane. The tires lose contact with the road and have little or no traction, so you might not be able to steer or brake. Another passage says surfaces where water collects create the conditions for hydroplaning. That matches the answer: the collected water causes hydroplaning.
8. If there is ice on the front of your side mirror:
- You should exit the roadway.
- You can expect ice to be on the roadway. ✓
- There will not be ice on the roadway.
Answer: B. You can expect ice to be on the roadway.
If there is ice on the front of your side mirror, you can expect ice to be on the roadway. The handbook lists vehicle icing as a sign of slippery roads. It says to open the window and feel the front of the mirror, mirror support, or antenna; if ice is there, the road surface is probably starting to ice up. Another passage says that ice on mirrors or wiper blades means the road most likely will be icy as well. So ice on the front of your side mirror is a warning to expect ice on the road and to slow down.
9. You are especially likely to encounter strong winds when:
- Coming out of tunnels. ✓
- Going into tunnels.
- Driving on shoulders.
Answer: A. Coming out of tunnels.
You are especially likely to meet strong winds when coming out of tunnels. The handbook's strong-wind section says strong winds make it hard to stay in your lane, and that this problem can be especially bad as you come out of a tunnel. That directly supports the answer. The passage does not tie the hazard to entering a tunnel or to driving on shoulders; it points to the moment you leave the sheltered tunnel and meet the wind.
10. Black ice is:
- Usually thick.
- Usually thin. ✓
- Not a hazard when driving.
Answer: B. Usually thin.
Black ice is usually thin — it is a thin, clear layer that lets you see the road underneath it. The handbook describes black ice as a thin layer that is clear enough to see the road underneath, which is why the road just looks wet. It also warns that any time the temperature is below freezing and the road looks wet, you should watch for black ice. So the layer itself is thin, not thick, and it is a real slipping hazard on cold, wet-looking pavement.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook