What Are the Automatic Fails on the G Road Test in Ontario?

The G road test uses the same scoring system as the G2 but adds highway driving assessment. A critical error is any action that creates an immediate safety risk or requires examiner intervention. The examiner will end the test on the spot if a critical error occurs.

Because the G road test includes highway driving, there is an entire category of highway errors that do not exist on the G2 test. These are high-stakes because highway mistakes occur at higher speeds and carry greater consequences.

Beyond the highway section, the G test also evaluates city and suburban driving. The same critical errors that apply to the G2 test also apply here. Consistent minor errors across multiple categories can accumulate into a fail even without a single dramatic critical error.

The most reliable way to avoid critical errors is to over-communicate your observations to the examiner through your actions. Check your mirrors every 5 to 8 seconds. Do exaggerated shoulder checks before every lane change. Signal early, before you brake. On the highway, plan your merge well in advance by matching speed and finding a gap before reaching the end of the on-ramp.