The interlock is a breathalyser fitted to your car’s ignition. If you are convicted of certain drink driving offences in Queensland, participation is mandatory. Here is exactly who must participate, how it works, and what happens if you refuse.
The Queensland Alcohol Ignition Interlock Program is governed by the Transport Operations (Road Use Management – Driver Licensing) Regulation 2021. Participation is mandatory for drivers convicted of the following:
A first-time low range offender (BAC 0.05–0.099) is not automatically subject to the interlock program. However, if convicted of any drink driving offence again within 5 years, mandatory interlock applies to the second offence — even if it is also only low range.
An alcohol ignition interlock is connected to a vehicle’s ignition system. It contains a breathalyser that analyses a breath sample from the driver. If any alcohol is detected, the vehicle will not start.
After your disqualification ends, your licence will have an ‘I’ condition. You may only drive a vehicle fitted with an approved interlock device. Driving without an interlock while holding an ‘I’ condition is a separate criminal offence.
Yes. Family members and others may drive the same vehicle, provided they also provide a zero-alcohol breath sample to the interlock before starting. The ‘I’ condition is on your licence; the interlock requirement attaches to the vehicle during the participation period.
If you are required to participate but refuse to install an approved device, you will be disqualified for an additional five years beyond your original court-ordered disqualification. This period begins only after your original disqualification ends.
Driving a vehicle not fitted with an interlock while you hold an ‘I’ condition licence carries similar consequences to driving while suspended — further disqualification and potential imprisonment.
Understanding the interlock requirement is part of preparing for your court appearance. The QLD Plea Program covers the complete sentencing process and helps you present the strongest possible case.