Interlock Streams A, B, and D: Reducing Your Driving Prohibition After a DUI in Ontario
A conviction for impaired driving, over 80, or refusal to provide a breath sample carries two separate consequences that affect your ability to drive. The first is a driving prohibition imposed by the court under the Criminal Code. The second is a licence suspension imposed by the Ministry of Transportation of Ontario (MTO) under the Highway Traffic Act. They run concurrently, but they are administered by different authorities and have different rules.
The result is that even a first-time DUI offender faces a minimum one-year driving prohibition — and potentially longer depending on the MTO’s administrative penalties. For most people, losing the ability to drive means losing the ability to work, care for family, and maintain any semblance of a normal life.
But there are ways to get back behind the wheel sooner. The ignition interlock program allows eligible drivers to resume driving with conditions before their full prohibition period expires. And the Stream A early resolution process is the fastest path to accessing that program.
This article explains how both work, who qualifies, and what the process looks like from start to finish. For the full breakdown of administrative licence consequences, see our detailed guide on MTO consequences for criminal driving offences.
Understanding the Standard MTO Penalty
Before explaining the streams, it helps to understand what you face without the program. Under the Highway Traffic Act, a conviction for an alcohol-impaired driving offence triggers:
- First offence: 1-year licence suspension, followed by a minimum 1-year ignition interlock installation period
- Second offence: 3-year licence suspension, followed by a minimum 3-year ignition interlock installation period
These MTO suspensions are separate from and in addition to the Criminal Code driving prohibition imposed by the sentencing judge. For the full picture of how these two systems interact, see our guide on MTO licence consequences for criminal driving offences.
The Reduced Suspension with Ignition Interlock Conduct Review Program allows eligible drivers to shorten the suspension portion in exchange for meeting specific requirements — including installing an approved interlock device sooner.
Stream A: First-Time Offender, Early Guilty Plea
Stream A offers the maximum reduction in suspension time. It is available to first-time offenders who resolve their case quickly.
Eligibility
To qualify for Stream A, you must:
- Be a first-time offender as determined by the Highway Traffic Act
- Plead guilty to the offence
- Be convicted, sentenced, and subject to a driving prohibition order within 90 days of the date of the offence — even if the offence occurred more than 90 days before sentencing
- Complete the two components of the program application (remedial measures program assessment and lease agreement with an approved interlock service provider) within 3 months of sentencing
- Not have been convicted of an offence involving bodily harm or death
- Not have been convicted of driving while disqualified within the past 5 years
- Not be subject to a court order prohibiting interlock use
- The offence must involve alcohol only — not drugs or a combination of drugs and alcohol
The 90-day window is tight. This is why early legal representation matters — your lawyer must review disclosure, negotiate with the Crown, and secure the guilty plea and sentencing all within that timeline. For more on what to expect at court, see our guide on your first court appearance.
Stream A Penalties vs. Standard
| Standard MTO Penalty | Stream A Reduced Penalty | |
|---|---|---|
| Licence suspension | 1 year | Minimum 3 months |
| Followed by interlock | Minimum 1 year | Minimum 9 months |
The difference is significant. Under the standard penalty, you are completely off the road for a full year before you can even start the interlock period. Under Stream A, you are back behind the wheel — with the interlock installed — after just 3 months.
In addition to the MTO suspension, the sentencing judge will impose the Criminal Code minimum penalties: a $1,000 fine and a 1-year driving prohibition. Impaired driving convictions cannot be discharged, so you will have a criminal record. For a full overview of mandatory minimums, see our article on mandatory minimums in Canadian criminal law.
If you are a first-time offender, the Crown is far more likely to agree to a joint submission for minimum penalties, making Stream A the fastest path back to driving.
Stream B: First-Time Offender, Does Not Meet Stream A Requirements
Stream B is the fallback for first-time offenders who are eligible for the interlock program but do not meet all of Stream A’s requirements — most commonly because the case was not resolved within the 90-day window.
This can happen for many reasons: the disclosure was late, the Crown would not agree to an early resolution, the case went to trial and resulted in a conviction, or the guilty plea simply occurred after the 90-day deadline.
Stream B Penalties vs. Standard
| Standard MTO Penalty | Stream B Reduced Penalty | |
|---|---|---|
| Licence suspension | 1 year | Minimum 6 months |
| Followed by interlock | Minimum 1 year | Minimum 12 months |
Stream B still provides meaningful relief — your suspension is cut in half — but the interlock period is longer than Stream A. You are off the road for 6 months instead of 3, and you carry the interlock for a full year instead of 9 months.
The Stream A vs. Stream B Trade-Off
This is where strategy matters. Pleading guilty quickly to qualify for Stream A gets you back on the road sooner. But if there are viable defences — a violation of your Charter rights at the roadside, problems with the breath test procedure, an unlawful stop, or a breach of your right to counsel — fighting the charges could result in an acquittal: no criminal record, no driving prohibition, no interlock, no suspension at all.
If you fight and lose, you fall into Stream B instead of Stream A. The cost is an additional 3 months off the road and a longer interlock period. Whether that trade-off is worth it depends entirely on the strength of your defences. This is one of the most important decisions in a DUI case, and it should not be made without a thorough review of the evidence by an experienced lawyer.
Stream D: Second-Time Offender, Early Guilty Plea
Stream D is for second-time offenders who meet similar early resolution requirements as Stream A — a guilty plea and sentencing within 90 days of the offence.
Eligibility
The eligibility requirements mirror Stream A, with adjustments for the higher stakes:
- Must be a second-time offender as determined by the Highway Traffic Act
- Must plead guilty and be sentenced within 90 days of the offence date
- Must not have been convicted of driving while disqualified within the past 10 years (5 years for first-time offenders)
- Must complete the program application components (remedial measures assessment and interlock service agreement)
- The offence must involve alcohol only
- No conviction for an offence involving bodily harm or death
Stream D Penalties vs. Standard
| Standard MTO Penalty | Stream D Reduced Penalty | |
|---|---|---|
| Licence suspension | 3 years | Minimum 9 months |
| Followed by interlock | Minimum 3 years | Minimum 18 months |
The reduction is dramatic — from 3 years off the road to 9 months. But the Criminal Code penalties for a second offence are severe regardless: mandatory minimum 30 days jail and a minimum 3-year driving prohibition. See our guide on mandatory minimums for more detail.
Second-time offenders who do not meet Stream D’s 90-day plea requirement face the full standard MTO penalty: 3 years of suspension followed by 3 years of interlock. There is no “Stream E” fallback equivalent to Stream B.
Who Is NOT Eligible for the Program
The Reduced Suspension with Ignition Interlock program is not available to:
- Third-time and subsequent offenders — if this is your third or later alcohol-impaired driving offence, you face a lifetime licence suspension from the MTO. You may apply for reinstatement after 10 years, but the interlock reduction program does not apply.
- Drug-impaired driving convictions — the program covers alcohol-impaired driving only. If you were convicted of drug-impaired driving or impairment by a combination of drugs and alcohol, you are not eligible.
- Convictions involving bodily harm or death — if the impaired driving caused an accident resulting in injury or death, you are excluded.
- Drivers convicted of driving while disqualified within the lookback period (5 years for first offenders, 10 years for second offenders).
- Drivers subject to a court order prohibiting the use of an interlock device during the prohibition period.
For third+ offenders and other excluded drivers, see our guide on MTO licence consequences for the full scope of what you face.
The Ignition Interlock Device
The ignition interlock device is a breathalyzer wired into your vehicle’s ignition system. Before you can start the car, you must blow into the device and register a blood alcohol concentration of 0.00. Not 0.05, not 0.02 — absolute zero. If you fail, the car will not start.
The device also requires random re-tests while you are driving. It will prompt you to blow at unpredictable intervals during your trip. If you fail a re-test or fail to provide a sample, the device logs the violation, your horn sounds, and your lights flash until you pull over and turn off the vehicle.
How Early Can You Get the Interlock?
For a first offence, you must serve a minimum of 3 months of your driving prohibition before you can apply for an interlock condition on your licence. Since the minimum prohibition is 1 year, this means you could be driving again — with the interlock installed — after just 3 months of being off the road.
The remaining 9 months of your prohibition are served with the interlock device on your vehicle. At the end of the full 1-year prohibition, and once all other conditions are satisfied, you can have the device removed and apply for full licence reinstatement.
The Application Process
Getting the interlock installed is not automatic. You must:
- Serve the minimum prohibition period (3 months for a first offence)
- Apply to the MTO for an interlock condition on your licence
- Have the device installed by an approved service provider
- Pay all applicable fees and provide proof of installation to the MTO
- Maintain the device for the required duration with no violations
The MTO will issue a conditional licence that restricts you to driving only vehicles equipped with an approved interlock device. You cannot drive any vehicle that does not have one installed.
Cost of the Interlock Program
The interlock device is not free. You are responsible for installation, monthly rental and monitoring fees, and removal costs. These vary by provider and can change, so confirm current pricing directly with an approved interlock service provider. These costs are in addition to your criminal fine, legal fees, increased insurance premiums, and the mandatory Back on Track program fees. A first-offence DUI is an expensive proposition even in the best-case scenario.
Interlock Violations
If the device records a violation — a failed breath test, a missed re-test, or evidence of tampering — the consequences are serious. Your interlock period can be extended, your conditional licence can be suspended, and in some cases you may be required to restart the program from the beginning.
The zero-tolerance policy is absolute. Even mouthwash or certain medications can trigger a failure. If you are on the interlock program, you must be meticulous.
The Back on Track Program
Before you can have your interlock removed and your full licence reinstated, you must complete the Back on Track program. This is a mandatory remedial measures program administered by the Centre for Addiction and Mental Health (CAMH).
Back on Track has two components:
- Education workshop: An 8-hour session covering the effects of alcohol and drugs on driving ability, the legal consequences of impaired driving, and strategies for separating drinking from driving
- Assessment: An interview with a clinician to determine whether you have a substance use problem that requires further treatment. Depending on the assessment, you may be required to complete additional treatment programming before you are cleared.
You must register for Back on Track as soon as possible after your conviction. There are waiting lists, and if you delay, it can push back your licence reinstatement date. The program has a registration fee that must be paid out of pocket — confirm current pricing directly with CAMH.
Failure to complete Back on Track means the MTO will not reinstate your licence — even after your criminal driving prohibition has expired.
Strategic Considerations: Stream A, B, or D — Choosing the Right Path
The decision between an early guilty plea (Stream A) and contesting the charges at trial (Stream B) is the most important decision in your case. For subsequent offenders navigating Stream D, the stakes are even higher. This decision should be made only after a thorough review of the disclosure and a candid assessment of the strengths and weaknesses of both the Crown’s case and your potential defences.
When Stream A Makes Sense
- The evidence against you is strong — clear breath readings, no procedural errors, video evidence consistent with impairment
- You are a first-time offender with no aggravating factors
- You need to resolve the matter quickly for employment or immigration reasons
- You want the earliest possible access to the interlock program to get back on the road
When You Should Fight the Charges
- Charter violations: Police failed to inform you of your right to counsel, denied you access to a lawyer, or subjected you to an unreasonable search or detention. A successful Charter challenge under sections 8, 9, 10(a), or 10(b) can result in the exclusion of the breath test results — which typically destroys the Crown’s case.
- Procedural errors: The ASD demand was not made properly, the breath samples at the station were not taken within the required time frame, or the breathalyzer was not properly maintained and calibrated.
- Unreasonable delay: If the case takes too long to get to trial (beyond 18 months in provincial court under R v Jordan), you may have a stay of proceedings argument.
- Weak evidence of impairment: For “impaired driving” charges (as opposed to “over 80”), the Crown must prove actual impairment of your ability to operate a motor vehicle. Officer observations alone are not always enough.
If any of these defences are available to you, a guilty plea through Stream A means giving up the chance at a complete acquittal — no criminal record, no driving prohibition, no interlock, no Back on Track, no insurance consequences. That is a significant thing to surrender.
For a broader overview of how Charter rights apply in criminal cases, read our article on Charter rights and criminal defence.
Related Offences
The interlock program and Stream A process discussed in this article apply primarily to the “standard” impaired driving offences under section 320.14 and 320.15 of the Criminal Code: operation while impaired by alcohol, operation with a BAC over 80 mg, and refusal to provide a breath sample.
If you are facing charges for drug-impaired driving or dangerous driving, the penalties and available programs may differ. These charges carry their own sentencing frameworks and the interlock program may not apply in the same way.
Get Legal Advice Before You Decide
If you have been charged with impaired driving in Barrie, Orillia, or anywhere in Simcoe County, do not assume that a quick guilty plea is your only option — and do not assume that fighting the charges is always the right call either. The correct strategy depends entirely on the facts of your case, the strength of the evidence, and the defences available to you.
At Mor Fisher LLP, we handle impaired driving cases every week in courts across Simcoe County. We will review your disclosure, identify every available defence, and give you a clear, honest assessment of whether Stream A or a trial is the right path forward.
Contact us today for a free consultation. The sooner we review your case, the sooner we can start building your defence — or getting you on the fastest path back to driving.