DriveTest Canada
  • Checked against Ontario Ministry of Transportation on 2026-08-28
  • 60 questions written here, every one with its citation

Ontario Class A commercial knowledge test

Class A knowledge test at a glance

Question count
Ontario Ministry of Transportation publishes no count
Not published by the licensing body
Pass mark
Not published as a number of questions
Not published by the licensing body
Fee
$122.75 package covering the knowledge test and the road test, for applicants under 65
Retake fee
$23.75 for each further knowledge test attempt
Minimum age
18
Where it is taken
At a licensing office or testing centre
DriveTest, Commercial Vehicles licence requirementsverified 2026-08-28

The format above is the one Ontario Ministry of Transportation sets, and it is on the page before anything else, because the numbers are what you plan around. Every row carries the record it was read from and the date it was checked.

  • Multiple choice, in two or three parts, marked on the spot and not timed. Around 30 minutes is what DriveTest says to expect.
  • You need 80 percent across the whole test to pass.
  • No question count is published for any Ontario commercial knowledge test, so we do not state one.
  • You need a full G licence or higher before you can sit it.
  • Mandatory entry level training has to be on your driving record before the road test, and the road test has to happen within a year of the knowledge test or you pay for the vision and knowledge tests again.
  • The air brake Z test is a separate knowledge test with a practical test of its own.
An unmarked tractor trailer in profile from a low angle on a prairie highway shoulder at first light, casting a long shadow across the road.
  • 60 questions written for the Class A knowledge test, each with the authority it rests on
  • Free to sit, with no account and nothing held back until you pay
  • Every run free, with the whole bank open and no part held back
Start the practice runSee what it covers

Nothing here is timed unless the real exam is timed, and nothing is held back except the answers the real exam holds back too.

What the questions cover

Every Ontario question sits under one subject, and the number beside it is how many we hold. The reading column goes to the lesson behind the subject.

SubjectQuestionsReading
Road signs20The lesson behind it
Emergencies and breakdowns6The lesson behind it
Speed and following distance5The lesson behind it
Parking and stopping5The lesson behind it
Intersections and turns4The lesson behind it
Documents, fines and demerit points4The lesson behind it
Passing and lanes3The lesson behind it
Sharing the road3The lesson behind it
Impaired and distracted driving3The lesson behind it
Weather and night driving3The lesson behind it
Right of way2The lesson behind it
Licensing and the graduated system2The lesson behind it

One question from the bank, in full

The question, the answer marked, the reason it is the answer, and the authority it rests on. Nothing is held back on this page and nothing is held back in a run.

OntarioRules of the road

A vehicle with air brakes is parked with the parking brake applied and the engine shut off. What is actually holding those brakes on?

  1. Air pressure being pushed into the brake chambers
  2. A cable running from the cab to each wheel
  3. A heavy spring in each chamber, which air pressure holds off while you drive
  4. The engine, through the transmission

The answer is C

Service brakes work by sending air to the chambers, but the parking brakes work the other way round. A strong spring wants to apply them all the time, and air pressure is what holds it back while the vehicle is in service. Take the air away and the spring does the work, which is why the vehicle stays braked with everything switched off.

Highway Traffic Act (Ontario)

How the Class A knowledge test passes

You can sit it from age 18.

Fees and rules change, so check the record itself before you pay for anything. The date beside each figure is the day we last read it.

What Ontario Ministry of Transportation does not publish

These are the fields the licensing body leaves out. They stay blank here rather than being filled with another province's number or with an estimate.

  • No published figure for the question count.
  • No published figure for the pass mark.

A run built on a missing length draws the whole bank instead of guessing at one, and the panel before the first question says so.

Reading for the Class A knowledge test

The lessons carry the rule, the guides carry the longer answer, and both end with the note that changes the answer in Ontario.

An uncontrolled rural crossroads with sight lines open across low fields, two vehicles approaching from different arms at a distance.Read

The 11 study lessons

Written for Ontario

Each lesson ends with the Ontario note that changes the answer, so the reading matches the exam you are sitting.
The interior of a quiet public service office with empty chairs in rows and a plain counter, winter light falling in bands across a pale floor.Read

What is on the G1 knowledge test

Ontario

What the G1 kiosk actually asks you, how the two halves are scored against each other, and what happens on the day from the counter to the result.
A four way intersection seen from above and to one side, lane markings and crosswalks clearly painted, three vehicles approaching from different arms in low winter sun.Read

The G1 and G2 restrictions, explained

Ontario

Which conditions attach to a G1, which ones survive the first road test into the G2, and what happens to a novice driver who breaks one.
A roadside gantry carrying two blank plates against a wide pale sky, both plates deliberately empty with nothing printed on them.Read

How Ontario road tests are marked, and what an automatic fail is

Ontario

How the marking on an Ontario road test works, what ends a test immediately, and why the number of allowed errors that circulates online is not something we will print.
All Ontario tests and stages

Questions people ask about this test

How many questions are on the G1 test?

Forty. The kiosk gives you 20 questions on road signs and 20 on rules of the road, and it scores the two sections separately.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27
How many mistakes can you make on the G1 test?

Four in each section. You need 16 correct out of 20 in road signs and 16 correct out of 20 in rules of the road, so a fifth wrong answer in either section ends your chance of passing that section.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27
What does the G1 test cost in Ontario?

The standard package is $159.75. It covers the G1 knowledge test, the vision test and your first G2 road test, so the road test is already paid for. A knowledge test retake on its own costs $15.75.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27
What happens if I pass one section and fail the other?

You have not passed the G1. Both sections have to reach 16 out of 20 on the same attempt, and each is judged on its own, so the next step is a retake at $15.75.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27
How long do I have to hold a G1 before the road test?

Twelve months, or eight months if you finish an approved driver education course. The course is the only way to shorten that wait.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27
How many DriveTest centres are there in Ontario?

More than 55 across the province, all run by the same contracted operator on behalf of the ministry.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27
Are some DriveTest centres easier than others?

The published results say yes. Road test pass rates measured across Ontario centres span about 30 percentage points from the strongest centre to the weakest, which is why booking location gets argued about so much.

CBC News freedom of information release of Ontario DriveTest results (2022 data)verified 2026-08-27
How long does the whole Ontario licence take?

Roughly 20 to 24 months from a fresh G1 to a full G, depending on how fast you clear each hold and how soon you can get a road test booking.

Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee scheduleverified 2026-08-27

Sources for this page

Each record below is where a number on this page comes from, with the date it was last checked against it.

  • DriveTest, Commercial Vehicles licence requirements

    Verified 2026-08-28

    Fees read from the DriveTest fee list on the same date.

  • Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee schedule

    Verified 2026-08-27

  • CBC News freedom of information release of Ontario DriveTest results (2022 data)

    Verified 2026-08-27

    Covers the 2022 data year.