Ontario Class D (DZ) overview

Ontario Class D (DZ): Signs, signals and markings

Signs that restrict trucks by lane, length, weight or cargo, clearance and truck warning signs, slow-moving and oversize signs, traffic lights and pavement markings.

  • 20 questions
  • Topic drill
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Signs, signals and markings · Question 1Score 0/0

A round sign shows a truck in a red circle with a slash. What does it mean?

Study reference: MTO Truck Handbook (online edition, 2026), Ch. 4 Traffic signs and lights — Signs, traffic lights, pavement markings

All 20 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

  1. A round sign shows a truck in a red circle with a slash. What does it mean?

    1. Truck parking only
    2. Truck route ahead
    3. No heavy trucks on this road
    4. Trucks must stop ahead
  2. An orange sign warns of milled or grooved pavement. What can be affected?

    1. Your radio reception
    2. Your fuel gauge
    3. Your stopping ability
    4. Your mirror alignment
  3. A sign warns that a structure ahead may not allow room for tall vehicles. What should a tall truck do?

    1. Speed up under it
    2. Choose another route
    3. Drive in the centre
    4. Lower its tire pressure
  4. What does a slow-moving vehicle sign look like?

    1. A green rectangle with an arrow
    2. A red octagon with white letters
    3. A yellow diamond showing a tractor
    4. An orange triangle with a red border
  5. A yellow left arrow follows a green left arrow. What does it mean?

    1. Turn now before it goes red
    2. Pedestrians may now cross
    3. Go straight through only
    4. Don't start the turn
  6. A sign shows "10 t" inside a red circle. What does it restrict?

    1. Trucks over 10 m long
    2. Vehicles over 10 tonnes
    3. Parking to 10 minutes
    4. Speed to 10 km/h
  7. What do EDR signs along a road mark?

    1. Electric vehicle charging points
    2. Express delivery truck routes
    3. A detour around a highway closure
    4. Exits reserved for dump trucks
  8. When may you turn left on a red light?

    1. Only if no pedestrians are near
    2. From any road after stopping
    3. From one-way onto one-way
    4. Never, anywhere in Ontario
  9. An orange sign shows a pilot vehicle. What must you not do?

    1. Slow below 50 km/h
    2. Use your headlights
    3. Pass the pilot or pace vehicle
    4. Follow the pilot vehicle
  10. What shape is a school zone sign?

    1. Eight-sided
    2. Round
    3. Five-sided
    4. Triangular
  11. A sign over the left lane shows a truck with a red slash. What does it mean?

    1. Trucks may pass here
    2. Trucks must use this lane
    3. No trucks in this lane
    4. Truck lane begins
  12. Two solid lines curve around a bridge pier on the road. What do they do?

    1. Show a school crossing ahead
    2. Steer traffic around it
    3. Mark a lane for trucks only
    4. Mark a no-parking zone
  13. A yellow sign shows a truck entering from the left side. What does it warn of?

    1. Truck entrance on the left
    2. No trucks allowed on the left
    3. Truck stop ahead on the left
    4. All trucks must turn left
  14. What must you do at a flashing red light?

    1. Stop only at night
    2. Slow down only
    3. Come to a complete stop
    4. Yield only to trucks
  15. A sign shows a dangerous goods symbol in a red circle with a slash. What does it mean?

    1. Fuel available at the next exit
    2. Dangerous goods route ahead
    3. Fire station entrance ahead
    4. No dangerous goods trucks
  16. What colour are guide (information and direction) signs?

    1. Green with white letters
    2. Orange with black letters
    3. Yellow with black letters
    4. Red with white letters
  17. A pedestrian starts crossing on a walk signal and the hand symbol appears. Who has the right-of-way?

    1. Turning vehicles
    2. The pedestrian still does
    3. Whoever moves first
    4. Trucks only
  18. The light turns yellow as you approach. What should you do?

    1. Speed up to clear it
    2. Always stop instantly
    3. Sound the horn and go
    4. Stop if you can do so safely
  19. A yellow sign advises trucks over 10 tonnes not to use a road. Is it a ban?

    1. Yes, a total ban
    2. Yes, with a $20,000 fine
    3. No, it is an advisory warning
    4. Yes, but only at night
  20. What does a solid line on the left side of your lane mean?

    1. Parking is allowed
    2. A bike lane is beside you
    3. You may pass freely
    4. It is unsafe to pass

Signs, signals and markings: key rules to remember

Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗

Basic shapes

  • Stop: red octagon. Yield: white triangle with red border. School zone: five-sided fluorescent yellow-green. Railway crossing: white X with red outline.
  • Regulatory signs are usually rectangles or squares; a green circle means allowed, a red circle with a slash means not allowed.
  • Warning signs are usually yellow diamonds; temporary-condition (construction) signs are orange diamonds; guide signs are green.

Truck-related regulatory signs

  • Signs can ban trucks from a lane, ban trucks over 6.5 m long from a lane, permit or ban heavy trucks on a road (sometimes only at set hours), limit vehicles to a weight (for example 10 tonnes) or to a load per axle (for example 5 tonnes).
  • Separate signs permit or ban trucks carrying dangerous goods on a roadway.
  • A sign with flashing signals means trucks must enter the inspection station.
  • Trucks over 5 tonnes need a valid 407 transponder to use the 407 ETR.
  • Bridge signs can show different weight limits for different truck types.

Truck-related warning signs

  • Clearance signs show the maximum vertical clearance (for example 3.9 m); some warn tall vehicles to choose another route.
  • A curve sign with a truck symbol advises trucks to slow down because of the curve's small radius.
  • Warning signs can advise trucks over 10 tonnes not to use a road, or show a truck entrance ahead on the side indicated.
  • Steep-hill warning: you may need a lower gear.

Other signs

  • Slow-moving vehicle sign: orange triangle with red border, for vehicles that travel 40 km/h or less.
  • Long commercial vehicle placard on the rear of a double-trailer combination up to 40 m long.
  • Temporary signs can double speeding fines in a construction zone when workers are present.

Traffic lights

  • A red light means stop at the stop line, or the crosswalk, or the sidewalk edge, or the intersection edge, in that order.
  • You may turn right on red after a full stop unless a sign forbids it, and left on red from a one-way road onto a one-way road.
  • A flashing green light or left green arrow with a green light is an advance green: oncoming traffic still faces red.
  • A yellow arrow after a left-turn arrow means do not start the turn; stop if you safely can.
  • Flashing red: full stop, then go when safe. Flashing yellow: proceed with caution.
  • Blank (power-out) signals: treat the intersection as an all-way stop.
  • A transit priority signal (white vertical bar) lets transit vehicles go while other traffic faces red.

Pavement markings

  • Yellow lines separate opposite directions; white lines separate traffic going the same way.
  • A solid line on your left means do not pass; a broken line means you may pass when clear.
  • Wide, closely spaced broken lines (continuity lines) on your left mean your lane is ending or exiting.
  • A pedestrian crossover is marked by double white lines with an X in each approaching lane and overhead yellow lights.

More signs and signals

  • EDR (emergency detour route) markers guide traffic around an unscheduled highway closure and back onto the highway.
  • Do not pass a pilot or pace vehicle carrying the temporary sign; milled or grooved pavement can reduce stopping ability.
  • A yellow light means stop if you can do so safely; otherwise go with caution.
  • A pedestrian already crossing when the hand symbol appears still has the right-of-way.
  • Two solid lines guide traffic around fixed objects such as bridge piers; yellow and black markings are painted on the objects.

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