Bad Weather & Night Driving — Oklahoma
Oklahoma CDL practice test: 421 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: 24 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 | Oklahoma CDL permit (CLP) knowledge tests |
| Topic questions | 24 (6% of 421 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
Not yet verified
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Questions (24)
1. How much water must be present for a vehicle to hydroplane?
- Usually several inches
- A good amount, such as a large puddle
- A small amount ✓
Answer: C. A small amount
2. 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.
3. 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.
4. The trailer hand valve should not be used while you are driving because:
- It will disconnect from the vehicle.
- You will stop the vehicle too quickly.
- It can cause a skid. ✓
Answer: C. It can cause a skid.
The trailer hand valve should not be used while driving because it can cause the trailer to skid. The handbook says the trailer hand valve, also called the trolley valve or Johnson bar, works the trailer brakes and should be used only to test them. It warns that using it while driving creates a danger of making the trailer skid. The foot brake sends air to all the brakes, including the trailer's, and the handbook says there is much less chance of a skid or jackknife when you use just the foot brake.
5. If a vehicle begins to hydroplane, the driver should:
- Accelerate.
- Release the accelerator and push in the clutch. ✓
- Pull in the clutch and brake.
Answer: B. Release the accelerator and push in the clutch.
6. Strong winds usually cause the greatest issues for:
- Lighter vehicles.
- Heavier vehicles. ✓
- Flatbed trailers.
Answer: B. Heavier vehicles.
7. A person should not smoke within ____ of a vehicle placarded for Class 3 or Division 2.1 materials.
- 50 feet
- 25 feet ✓
- 100 feet
Answer: B. 25 feet
Do not smoke within 25 feet of a vehicle placarded for Class 3 flammable liquids or Division 2.1 gases. The handbook's no-smoking rule sets a 25-foot buffer around a placarded cargo tank carrying Class 3 flammable liquids or Division 2.1 gases. It also repeats that 25-foot limit for smoking or carrying a lighted cigarette, cigar, or pipe near certain vehicles. Because the passage directly names 25 feet for these placards, that is the distance to use. The other figures in the handbook cover different situations, such as attending a parked placarded vehicle, not smoking near hazardous materials.
8. A thin layer of ice that forms on road surfaces is called:
- White ice.
- Black ice. ✓
- Blue ice.
Answer: B. Black ice.
A thin layer of ice on a road surface is called black ice. The handbook's slippery-road section defines black ice as a thin, clear layer that lets you see the pavement underneath. Because it is clear, it can make the road look wet instead of icy. The passage also warns that when the temperature is below freezing and the road looks wet, you should watch for black ice. That description matches the question exactly, so black ice is the correct term.
9. Roads are especially slippery right after it begins to rain because:
- The water mixes with oil and grease on the road. ✓
- Tires are not made to drive in wet weather.
- The water yet hasn't absorbed the dirt and grease.
Answer: A. The water mixes with oil and grease on the road.
Roads are especially slippery right after rain begins because the water mixes with oil and grease left on the road. The handbook says that just after it starts to rain, water mixes with oil left on the road by vehicles, making the road very slippery. If rain continues, it washes the oil away. That oil-and-water film reduces traction, and the handbook notes that slippery roads make stopping take longer and turning harder without skidding. So the first rain is the risky time, before the oil has been washed off.
10. Hydroplaning usually occurs:
- When tires are properly inflated.
- When driving at speeds slower than 15 mph.
- In areas where water collects on the road. ✓
Answer: C. In areas where water collects on the road.
Hydroplaning usually occurs in areas where water collects on the road. The handbook says that when water or slush collects on the road, your vehicle can hydroplane. The tires lose contact with the road and have little or no traction, so you may not be able to steer or brake. It also says road surfaces where water can collect create conditions for hydroplaning, and you should watch for signs of standing water such as clear reflections and tire splashes. Low tire pressure or worn tread makes hydroplaning more likely.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook