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Interlock Program in WA

The Interlock Program in WA (Western Australia) is a restricted driving program for those convicted of serious or repeat alcohol-related driving offences. It aims to improve road safety in the state by preventing drink drivers from operating a vehicle while over the prescribed limit, and by channelling them into assessment and treatment programs.

The program is mandatory from October 2016 and applies only to offences committed after its commencement. The applicable legislation is the Road Traffic Act 1974 as amended by the Road Traffic Amendment (Alcohol Interlocks and Other Matters) Act 2015.

Interlock Program for Drink Drivers in Western Australia

When is an interlock program in WA ordered?

A driver will be ordered into the interlock program in WA if they are convicted of:

Are there any exemptions?

Exemptions to the program are few. You may only be exempted if:

  • you live in excess of 150klms from an approved technician, or
  • the offence committed is one of refusing a breath sample and you can provide medical evidence that you are not physically able to supply the requisite volume of breath.

What does the interlock program require?

If you have committed one of the relevant offences and are ordered to participate in the program, to be able to drive, you must have your vehicle – whether a car, motorcycle, truck, or other vehicle – fitted with an interlock device. You must not drive any vehicle other than one that is fitted with the device.

You must have it fitted by an approved technician, and you are then required to have it serviced and checked, and the data downloaded, every 30 days. All costs are your responsibility, including for the removal of the device.

Once the device has been fitted, you will be granted an extraordinary licence which includes an interlock condition. You cannot activate the vehicle until you have provided a breath sample registering a blood alcohol content (BAC) of less than 0.02. Readings above this point will lock the vehicle and the breach will be recorded. Whenever a reading over the limit is recorded, it will be presumed that you were the one blowing into the device. You will also be required to provide breath samples at random intervals over the course of a journey.

You must not tamper with the device, or attempt to circumvent it, and you must not allow anyone else to do so either.

Before you can exit the program, you must show that you can separate your drinking and your driving for the period for which you have been disqualified – a minimum of 180 consecutive days.

How long will I be on the interlock program in WA?

The duration of your participation in the interlock program in WA is dependent upon the type of licence you hold, the offence committed, and the disqualification period imposed by the courts.

At a minimum, for those who have not previously held an extraordinary driver’s licence, the program will last for 6 months. For those who have been disqualified from driving but have been granted an extraordinary licence, you must participate in the program for the period of time for which you have been disqualified from driving (a minimum of 6 months).

In some cases, a driver may be permanently disqualified from driving but permitted to hold an extraordinary licence. In these cases, the driver must participate in the program for a minimum of 3 years.

How much will it cost me?

The cost of the interlock program in WA is the responsibility of the driver. It is likely to cost from $1,600 to $2,200 though some variation is likely depending on factors such as location and distance from approved technicians. You may be able to access a concession rate reducing the monthly cost by $50.

The pricing is comparable to programs in other Australian states and territories. For example, interlock orders in NSW (New South Wales) currently cost drivers approximately $2,200.

What happens if I don’t obey the order?

If you drive a vehicle that does not have an interlock device installed, you will have committed another offence as you will be driving unlicensed. You may be fined, face further disqualification from driving, or you may be imprisoned.

If you do not take your vehicle to have the device serviced at the required time, it will disable your vehicle. The only way to unlock the device is for a technician to attend. This will incur extra costs for which you will be responsible.

If you record a BAC of 0.02 or more, the device will prevent the vehicle from starting and your reading will be recorded.

Failure to comply with any of the conditions may result in a longer period of restricted driving. You may also have to participate in an assessment and treatment program with the WA Mental Health Commission.

This article reflects the state of the law as at 24 February 2016. It is intended to be of a general nature only and does not constitute legal advice. If you require legal assistance, please telephone 1300 636 846 or request a consultation at


Michelle Makela

Michelle Makela is one of our Legal Practice Directors and the National Practice Manager. She holds a Bachelor of Laws, a Bachelor of Science (Psychology) and a Master’s in Criminology. Michelle has had a varied career, working in commercial litigation, criminal law, family law and estate planning. Michelle joined Go To Court Lawyers in 2011. She now supervises a team of over 80 solicitors across Australia.

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