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Ignition Interlock Device

An Ignition Interlock Device, referred to as an "IID," is an after-market device which is installed in a vehicle. The IID is connected to the starter or ignition, or other onboard computer system of a vehicle. The device prevents a driver from operating the vehicle if the driver has been drinking. Before starting the vehicle, a driver must blow into the device; if the driver's BAC is at or over a pre-set limit (0.02 in Vermont) the IID will not allow the vehicle to start. Once the vehicle is started, at random times during the operation of the vehicle, the device will prompt the driver to provide another breath sample, referred to as "random retests." If the breath sample is not provided, or if the breath sample is at or exceeds a BAC of 0.02, the IID will log the event as a failure, and will then signal the vehicle to begin flashing the lights and sounding the horn. This will continue until the vehicle is turned off, or a clean breath sample has been provided.

Application for an Ignition Interlock Device Restricted Driver's License (IID & RDL) must be made by contacting this Department at 802-828-2061. We will review your driving record to determine if you are eligible to apply for an RDL; we will then send you a packet of information regarding your eligibility. It is very important that you contact this Department prior to visiting any office to assure that all requirements have been met.

For more information about RDL call 802 828-2061 or contact us by email.

Download the PDF form to your computer and then open it with Adobe Reader

Title Sort descending ID# Description
Ignition Interlock Breath Volume Waiver
VL-097
To apply for a breath volume waiver for use of an IID.
Ignition Interlock Participation Agreement
VL-085
Agreement and commitment to fulfill the Ignition Interlock program requirements.
Ignition Interlock Program FAQs
VL-086
Ignition Interlock Program FAQs
IID Certification of Installation
VL-082
Certification completed by the installer of the IID. Installer must be certified to provide ignition interlock device services in Vermont.
IID Device Certification
VL-079
For manufacturers of Ignition Interlock Devices wishing to have a device certified for use in Vermont
IID Manufacturer/Installer Certification
VL-078
Application for Ignition Interlock Providers wishing to become certified to operate in Vermont
Law Enforcement Request for Ignition Interlock Data
VN-223
Used by Law Enforcement to request data on drivers required to use an Ignition Interlock Device.
RDL Application
VL-080
Application to obtain or renew an Ignition Interlock Restricted License

FAQs

What happens if I have repair work or a Vermont State Inspection done on my IID equipped vehicle?

We strongly suggest that you notify your installer before performing vehicle maintenance, service or repairs that would involve starting or driving your vehicle or disconnecting the battery.  Your auto repair technician can contact your installer for specific instructions on how to avoid recording erroneous violations.

What happens if I fail the breath test when I try to start my car?

The vehicle will not start and the IID will enter a short lockout period of a few minutes.  This lockout period allows an opportunity for the alcohol to dissipate from the mouth and for you to consider the reason for the failed breath alcohol test, for example; is the failure a result of the use of mouthwash, cough syrup, etc., or as a result of consuming too much alcohol.  The IID will record the failure, which will be noted in the data report.  If you make 3 attempts to start a vehicle with a BAC of .04 or above, your IID requirements will be extended for a period of 3 months.  

What if I forget to bring my car to the installer for servicing?

The device will give you a reminder 7 days prior to a scheduled service date, followed by a warning to obtain service within 5 days.  If you fail to bring your vehicle to the installer for service within those 5 days, the IID will place your vehicle in a permanent lockout state; the vehicle would have to be towed to the installer for service before you can operate it again.  Failure to bring your car in for service will result in an extension of your RDL requirements.  

What kind of information does the IID record?

The IID collects and stores the information below, which is reported to the Department of Motor Vehicles and the Department of Corrections.  This information is also provided to Project CRASH.

  • The date and time of any use, or attempted use of a vehicle including a photo of the driving compartment.
  • The date and time of any attempt to tamper, circumvent or bypass the device.
  • The date, time and alcohol concentration, in grams per 210 liters, of each breath sample provided to the device.
  • The date and time of any malfunctions of the device.
  • The date and time of any failures to provide retest samples.
  • The date and time a “service required” message is issued to the customer by the device.
  • The date any service is performed.
  • The mileage and hours of operation of the vehicle since the previous service was performed.
Does the IID need to be serviced or maintained in any way?

Yes.  Once installed in your vehicle, the IID must be calibrated and inspected by a certified installer, or “swapped out” (if applicable), every 30 days for the duration of the terms and requirements of an RDL.  The inspection is done to make sure the IID is working properly and to detect any issues of non-compliance.  At the time of inspection, the installer will:

  • Review the data recorded in the device’s memory.
  • Inspect the device for indications of tampering.
  • Calibrate the device.
  • Forward data reports to both DMV.
What is an Ignition Interlock Device

An Ignition Interlock Device, referred to as an “IID”, is an after-market device which is installed in a vehicle.  The IID is connected to the starter or ignition, or other on-board computer system of a vehicle.  The device prevents a driver from operating the vehicle if the driver has been drinking.  Before starting the vehicle, a driver must blow into the device; if the driver’s BAC is at or over a pre-set limit, 0.02 in Vermont, the IID will not allow the vehicle to start.  Once the vehicle is started, at random times during the operation of the vehicle, the device will prompt the driver to provide another breath sample, referred to as “random retests”.  If the breath sample is not provided, or if the breath sample is at or exceeds a BAC of 0.02, the IID will log the event as a “failure”, and will then signal the vehicle to begin flashing the lights and sounding the horn.  This will continue until the vehicle is turned off, or a clean breath sample has been provided.

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