How the programme actually works

What the “I” on your licence means

It means you may drive only a vehicle fitted with an approved ignition interlock. Not your partner’s car, not a rental, not a work van, and not for a road test. Ontario can also charge a vehicle owner who knowingly lets you drive theirs without one.

Two things follow from that which people rarely connect. First, the condition does not pause for a DriveTest appointment. Second, the mismatch works in both directions — a car with a device and a licence without an “I” is equally out of order.

Two ways to end up in the programme

A Criminal Code impaired driving conviction makes the condition mandatory, at a minimum of one year for a first offence and three for a second. Three or more administrative suspensions in ten years brings a minimum of six months instead. The routes behave differently at removal time: convictions need a Substance Use Assessment form and a medical sign-off, administrative suspensions need nothing at all.

Performance failures versus programme violations

These get confused constantly and the difference is expensive.

• Performance failures — blowing over 0.02, or missing a rolling retest. Counted only during your monitoring window, which is the last three months for a first-time convicted offender. A failure adds three months.
• Programme violations — tampering, a conviction for driving without the device, or a missed appointment with your provider. Counted for the entire duration, and the extensions start at six months.

A missed calibration booking sits in the same category as tampering. That is the single most avoidable mistake in the whole programme.

The reduced suspension streams are a separate thing

Streams A, B and D shorten the suspension, not the programme. They have their own eligibility rules, a hard 90-day deadline measured from the date of the offence, and an application with exactly two components — a Back on Track assessment and a signed device lease. No driving school forms any part of that application.

Read the long-form version in the ontario ignition interlock program, explained. If a road test is part of your route back, we cover interlock car rental for a G2 or G road test and the ten-hour interlock training course. Related reading: using an ignition interlock device and the G2 road test after a DUI, or browse every Ontario DUI licence recovery article.