Ontario’s graduated licensing system is designed to help new drivers build experience and confidence over time. 

The journey begins with the G1, followed by the G2, and finally the full G license. While each step brings more freedom, it also comes with greater responsibility—and stricter testing.

Passing the G2 and G tests is a crucial part of earning your independence on the road. These exams aren’t just formalities—they assess your ability to drive safely, responsibly, and confidently under real-world conditions. 

We’re breaking down the six most common mistakes that cause a road test failure, whether you’re going for your G2 or G license. Let’s get into it so you can pass the first time.

Whether you’re a first-time driver or upgrading to a full G license, the Ontario road test process can be nerve-wracking. 

Knowing what to expect—and what common mistakes to avoid—can dramatically improve your chances of passing.

Know about Ontario Road Test System

Before diving into the common mistakes, it’s important to understand how the road test system in Ontario works. The G2 test focuses on basic driving skills like stopping, turning, and parking in a quiet area. 

The G test is more advanced — you’ll be tested on highway driving, merging, and more complex maneuvers. Both tests are designed to evaluate not just your technical skill, but also your ability to drive calmly and safely under pressure.

Knowing how many mistakes are allowed in the G2 test in Ontario helps manage your expectations. While there’s no fixed limit for minor errors, a single major error or accumulation of several minor ones could lead to a fail. Mistakes are evaluated based on their severity and potential safety impact.

Your car matters too. A vehicle that isn’t roadworthy — brake lights out, low fuel, expired registration, or a windshield crack in your line of vision — can get your test cancelled before you even start. 

Always check your vehicle thoroughly the day before the test and bring all required documents including your license, vehicle ownership, and insurance.

The 6 Most Common G2 and G Road Test Mistakes

1. Incomplete Shoulder Checks During Lane Changes or Turns

It’s easy to forget a shoulder check when you’re nervous, but it’s one of the first things examiners notice. Missing a shoulder check might seem small, but it’s one of the most frequent reasons for a drive test fail. 

Examiners watch closely when you merge, change lanes, or make turns. Failing to check your blind spot can put cyclists or pedestrians at serious risk.

Tip: Practice making shoulder checks smooth and consistent. Look over your shoulder briefly every time you’re about to move laterally — even in quiet areas. Integrate it into your routine so it becomes second nature.

2. Rolling Stops at Stop Signs

A rolling stop — where you slow down but don’t fully stop — is an instant red flag. Legally, a full stop means your wheels stop moving completely before the white line.

Rolling through a stop sign, especially near schools or intersections, shows poor control. It’s one of the most common reasons people fail their G2 test or G test, and it’s easily avoidable.

Tip: Always count to two after coming to a full stop to ensure you’ve completely halted. Then, look left, right, and left again before proceeding. Avoid creeping forward unless you have a clear view of cross traffic.

3. Poor Lane Discipline and Positioning

Another common reason for failing a G test is bad lane discipline. This includes drifting, turning from the wrong lane, or cutting across lanes too late. If you’re not sure which lane to use, remember: right lane to right lane, left to left.

Practice keeping your vehicle centered and using your mirrors. Examiners want to see that you’re aware of your surroundings and can maintain proper lane position without overcorrecting.

Tip: Before a turn, position your car in the correct lane well in advance. Maintain your lane during and after turns unless signage or road markings indicate otherwise. Use your mirrors to stay centered and avoid weaving within your lane.

4. Speeding or Driving Too Slowly

Speeding is an obvious issue, but many test-takers fail because they drive too slowly, especially in residential zones. Going well under the speed limit can be just as dangerous as speeding — it shows you’re not confident or aware of traffic flow.

Adjust your speed to match road conditions, weather, and posted limits. If you’re unsure, remember that how many mistakes are allowed in G2 test is less important than whether your driving could cause confusion or risk to others.

Tip: Stay within 5 km/h of the posted speed limit whenever possible. Use quick glances at your speedometer and avoid fixating on it. Maintain flow with surrounding traffic while obeying limits.

5. Poor Observation at Intersections and Crosswalks

Failing to scan intersections or not noticing pedestrians is a serious safety issue. Examiners want to see that you’re looking ahead and anticipating potential hazards.

A common road test mistake is looking left and right too quickly—or not looking at all. This includes rushing through turns without checking for oncoming traffic or pedestrians, especially during left turns.

Tip: At any intersection, make a deliberate effort to scan left, center, and right before entering. Make eye contact with pedestrians when possible and always yield when required. Be cautious when proceeding through yellow lights — slamming brakes or running a stale yellow can both lead to failure.

6. Improper Merging or Lane Changes on Highways (G Test Only)

If you’re doing the full G test, highway merging and lane changes are critical. Poor timing or hesitation while merging onto a highway is a major error that could result in immediate failure.

Many drivers either accelerate too slowly on the on-ramp or fail to shoulder check before changing lanes. Both mistakes signal a lack of confidence and situational awareness.

Tip: When merging, build up speed on the ramp to match the flow of traffic. Shoulder check, signal early, and merge smoothly without cutting other drivers off. Once on the highway, maintain a safe following distance and avoid unnecessary lane changes.

Final Thoughts

Ontario’s G2 and G road tests are designed to test real-world driving skills. By understanding what causes most people to fail—and actively practicing these areas—you’ll significantly improve your chances of passing.

Take each practice session seriously. Build habits like full stops, consistent shoulder checks, and good observation. And on test day, stay calm and focused.

If you’re wondering how many mistakes are allowed in G2 test Ontario, remember that it’s not just about counting errors—it’s about whether you’re demonstrating safe, legal, and confident driving from start to finish.

Good luck—and drive safe!

G2 and G Road Test FAQs