Traffic Signs & Signals — 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. Traffic Signs & Signals: 9 questions.
Regulatory, warning and guide signs, plus traffic light and pavement marking questions.
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 | Traffic Signs & Signals |
| License test | Ontario Commercial knowledge tests (Class A–F, Z air brake) |
| Topic questions | 9 (4% 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 (9)
1. When a traffic light turns yellow, what is the driver advised to do?
- Continue driving at the same speed
- Stop if it's safe to do so ✓
- Immediately hit the brakes
- Speed up to cross before it turns red
Answer: B. Stop if it's safe to do so
When the light turns yellow, you should stop if it is safe to do so. The truck handbook says a yellow or amber signal means red is about to appear. The instruction is to stop when you can do so safely; if you cannot, you should continue with caution. That matches stopping only when it is safe, rather than treating every yellow light the same. The handbook does not tell you to keep your speed, brake immediately, or speed up to beat the red.
2. When making a left turn, which method should you use to avoid striking a vehicle or a sign post on an island?
- Ask a passenger to keep an eye on the left side
- Use your left outside mirror ✓
- Turn your head around fully to the left
- Use your right outside mirror
Answer: B. Use your left outside mirror
Use your left outside mirror to watch the trailer's path through a left turn. The handbook says that when you turn left in a truck, the trailer can swing off its path, and unless you watch that path in your left outside mirror, the trailer may hit a vehicle or a sign post on an island. The mirror is what lets you see where the trailer is actually going, so you can turn in a wide arc and bring the unit back to its proper position just right of the centre line once the turn is done.
3. When are you required to stop for a stopped school bus with red lights flashing?
- Only during school hours
- Only in the evening
- At all times ✓
- Only during school days
Answer: C. At all times
You must stop at all times when a stopped school bus has its red lights flashing. The truck handbook says school bus rules apply on any road, whatever the number of lanes or the speed limit, and drivers should expect to stop at any time rather than only during school hours. It also says you must stop whenever you approach a stopped school bus with its upper alternating red lights flashing, whether you are behind it or coming toward it. That makes the duty depend on the flashing red lights, not on the time of day or the school calendar.
4. What is commonly known as a traffic beacon?
- A barricade with a warning light
- A traffic light with green, yellow, and red lights
- A traffic officer with a whistle and flag
- A single flashing light hung over an intersection or placed over signs or on obstacles in the road ✓
Answer: D. A single flashing light hung over an intersection or placed over signs or on obstacles in the road
A traffic beacon is a single flashing light hung over an intersection, or placed over signs or on obstacles in the road. The handbook gives this exact definition in its section on traffic lights and traffic beacons. The key detail is that it is one flashing light, and it can hang over an intersection or sit over signs and obstacles in the road. Matching that description to the choices leaves only the single flashing light, so the answer follows directly from the handbook wording rather than from any guess about warning devices.
5. A vehicle being used for the removal of snow from a roadway must be equipped with a
- flashing red light.
- flashing green light.
- flashing blue light. ✓
- flashing amber light.
Answer: C. flashing blue light.
A vehicle used for removing snow from a roadway must have a flashing blue light. The truck handbook passage on snow plows says snow-removal vehicles on public roadways are equipped with flashing blue lights that can be seen from 150 metres. It also explains that these blue lights warn drivers of wide, slow-moving vehicles. That direct statement matches the bank answer, so the required equipment is the flashing blue light, not the red lights used by emergency vehicles.
6. What must you do at a stop sign with a painted stop line?
- Crawl forward at about 8 km/h.
- Come to a complete stop at the stop sign.
- Come to a complete stop before the stop line. ✓
- Glance around quickly before proceeding.
Answer: C. Come to a complete stop before the stop line.
Come to a complete stop before the painted stop line. The truck handbook says a stop sign means a complete stop, and when a stop line is painted on the pavement you stop at that line. It adds that only when there is no line do you move on to the crosswalk, sidewalk edge or intersection edge. So with a painted line, the line is your stopping point, not the sign itself. After stopping, you wait until the way is clear before entering the intersection.
7. When there are visible signs warning of a possible wheel, hub, or bearing failure, what sort of defect is it considered?
- None
- Minor
- Inconsequential
- Major ✓
Answer: D. Major
Visible signs of a possible wheel, hub or bearing failure are treated as a major defect. The handbook says the inspection schedule sorts defects into just two groups, major and minor. When something is a minor defect, you record it on the report and tell the operator, and you can keep driving. A major defect is different: you are not allowed to drive the vehicle with one, and major defects must be repaired before the trip continues. A wheel, hub or bearing that shows warning signs is a wheel-end problem, so it belongs in the group that keeps the truck parked until it is fixed.
8. What does a flashing red beacon above an intersection signify?
- Come to a full stop and proceed when safe to do so ✓
- Immediately turn right
- Traffic from all directions must stop
- Proceed with caution
Answer: A. Come to a full stop and proceed when safe to do so
A flashing red beacon above an intersection means you must come to a full stop and proceed only when it is safe to do so. The handbook states that a flashing red beacon above an intersection or stop sign requires a complete stop. You may move through the intersection only when it is safe. That is exactly what the correct choice describes: stop fully, then continue when the way is clear.
9. What does a red and orange sign displayed by farm machinery on the road indicate?
- The machinery is carrying dangerous goods
- The machinery is large and needs more space to turn
- The machinery is a slow-moving vehicle ✓
- The machinery is heading to a farm
Answer: C. The machinery is a slow-moving vehicle
A red and orange sign on farm machinery means the machinery is a slow-moving vehicle. The handbook describes the slow-moving vehicle sign as an orange triangle with a red border. It tells drivers that the vehicle will be moving at 40 km/h or less. Farm tractors, implements and machinery that cannot keep speeds above 40 km/h must display it on the road. That is why the sign points to a slow-moving vehicle: you should recognize it as a warning to watch for a vehicle moving well below normal traffic speed and adjust your speed.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook