Bad Weather & Night Driving — Ontario
Ontario commercial knowledge test practice: 242 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: 6 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 | Ontario Commercial knowledge tests (Class A–F, Z air brake) |
| Topic questions | 6 (2% of 242 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 (6)
1. When driving in fog, you should use
- parking lights.
- parking lights and high-beam headlights.
- low-beam headlights. ✓
- high-beam headlights.
Answer: C. low-beam headlights.
In fog you should drive with your low-beam headlights on. The handbook's fog section tells you to make sure the full lighting system is on and to use low beams. It explains the reason: high beams bounce off the moisture droplets in the fog and make it harder to see. If the truck has fog lights, they are used in addition to the low beams, not instead of them. Parking lights alone would not meet the instruction to have the full lighting system turned on.
2. When driving at night, you should do which of the following?
- Make sure you can stop within the distance you can see. ✓
- Flash your headlights at approaching drivers who forget to switch from high beam to low beam.
- On well-lit roads, you can use your parking lights instead of your headlights.
- Travel at the posted speed limit.
Answer: A. Make sure you can stop within the distance you can see.
You should make sure you can stop within the distance you can see. The truck handbook describes overdriving your headlights as a situation where your stopping distance is longer than the distance your headlights let you see. It says that is dangerous because you may not have enough room to stop safely. The rain section gives the same practical rule: drive slowly enough to stop within the distance you can see. At night, that means keeping your speed matched to visibility rather than assuming the posted limit is safe.
3. What is a factor that may cause a vehicle to skid?
- Driving slowly in high gear
- Over-braking late on a slippery surface or on a curve ✓
- Driving an older vehicle
- Driving on a flat, dry surface
Answer: B. Over-braking late on a slippery surface or on a curve
Over-braking late on a slippery surface or on a curve is a factor that may cause a vehicle to skid. The handbook says most skids happen on slippery surfaces and can result from hard braking or aggressive turning or accelerating. It also warns that braking or accelerating while steering can push the tires closer to losing grip, and it advises avoiding sudden steering, braking or accelerating. Over-braking late, especially on a slippery surface or in a curve, matches those conditions.
4. What should you do when facing oncoming vehicles with bright headlights at night?
- Close your eyes briefly
- Look up and slightly to the left of the oncoming lights
- Keep looking straight ahead
- Look up and slightly to the right of the oncoming lights ✓
Answer: D. Look up and slightly to the right of the oncoming lights
When oncoming headlights are bright at night, look up and beyond and slightly to the right of those lights. The handbook describes glare as dazzling light that makes it hard to see and be aware of what others are doing. For night glare from oncoming vehicles, it gives a specific viewing direction: look up and beyond and slightly to the right of the oncoming lights. That is exactly what this answer says, so it matches the official guidance rather than leaving you staring into the bright lights.
5. If a bus becomes disabled on a roadway at night, flares or reflectors must be placed approximately _________ in front of and behind the vehicle.
- 15 metres (50 feet)
- 30 metres (100 feet) ✓
- 90 metres (300 feet)
- 60 metres (200 feet)
Answer: B. 30 metres (100 feet)
Flares or reflectors must be set out approximately 30 metres (100 feet) in front of and behind the disabled vehicle. The truck handbook's emergency warning device section says that when visibility is limited and you cannot move your commercial vehicle off the roadway in a speed limit zone above 60 km/h, you must place one type of emergency warning device about 30 metres (100 ft.) to both the front and the rear. Limited visibility means the period from half an hour before sunset to half an hour after sunrise, which is the night situation in the question. A bus is a commercial vehicle, so that distance is the one to remember.
6. Which of the following statements about a vehicle's retarder is FALSE?
- Its use is often restricted in residential areas.
- It is powerful enough to replace the service brakes. ✓
- It is more efficient at a higher engine rpm and in a lower transmission gear.
- On a slippery surface, it may make a skid more likely.
Answer: B. It is powerful enough to replace the service brakes.
The false statement is that a retarder is powerful enough to replace the service brakes. The handbook calls engine brakes, retarders or auxiliary brakes devices that slow the vehicle and help avoid excessive brake temperature. Because it describes them as assistance, it does not support the idea that a retarder can take the place of the service brakes. The supplied passages say nothing about residential restrictions, engine rpm or gear selection, or skids on slippery surfaces, so the reliable point from the text is that a retarder is an auxiliary aid, not a replacement.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook