This is one of the most important rules for new drivers: every G1 and G2 licence holder, at any age, must maintain a blood alcohol concentration (BAC) of zero while driving. This is a condition of the licence itself under the Highway Traffic Act, not just a guideline.
- A G1 driver’s supervising driver must also keep BAC under .05 — and zero if that supervisor is 21 or under.
- The same zero-tolerance rule applies to cannabis, and to anyone 21 or under regardless of what licence class they hold.
- Being caught with any alcohol in your system at the roadside brings an immediate 24-hour licence suspension. A conviction can bring a fine and at least a 30-day suspension, separate from demerit points.
This rule doesn’t end when you get your full G licence if you’re under 22 — the age-based zero-BAC rule still applies. Confirm current rules at ontario.ca.