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.

Related Forms & Information

FAQs

Contact the manufacturer of the IID installed in your vehicle.  A list of manufacturers can be found on our website dmv.vermont.gov or may be found in the information, pamphlet or manual you received when the IID was installed in your vehicle. 

Vermont requirements still need to be maintained.  Contact the manufacturer of your IID to locate an authorized interlock installer in the jurisdiction you will be in, who will provide you with the required services.  It is your responsibility to work with your interlock manufacturer and authorized installer to provide us with all required reporting until you return to Vermont.

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.

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.  

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.  

Yes.  When the IID is serviced every 30 days, the installer forwards the data reports to DMV.  If the data report indicates a failure to comply with any of the interlock program requirements, it may result in an extension of your RDL requirements.

No.  The IID will randomly ask for breath tests (“random retests”) while the vehicle is running.  If you fail to do the retest within 10 minutes, the horn will sound repeatedly and the headlights will flash until the vehicle is turned off.  The IID will log this as failure to provide a “random retest” which may lead to a permanent lockout state.

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.

Some manufacturers perform “swap outs” instead of requiring you to go to an installer every 30 days.  The manufacturer will send you a new unit every 30 days, at which time you will remove the current device, and replace it with the new device.  When the manufacturer receives the device you removed, they will:

  • Review the data recorded in the device’s memory.
  • Inspect the device for indications of tampering.
  • Forward data reports to both DMV.

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.

Yes.  The RDL holder is not responsible for other drivers using the IID. If another driver blows numbers we (DMV) will not count it as a “fail” toward an extension

No.  For safety reasons, the device cannot turn off the vehicle while you are driving.  If you turn the vehicle off, it will not start again, but it will not turn off while you are driving.

If you have failed the “random retest” breath test, or if you do not provide a breath sample for a “random retest”, the flashing of lights and sounding of the horn is a mechanism of alerting law enforcement who are in the area you are travelling.  It is a warning that they should conduct a traffic stop on your vehicle.

If you fail to do the retest within 10 minutes, the horn will sound repeatedly and the headlights will flash until the vehicle is turned off.  Once the vehicle is turned off, the IID will not allow you to restart the vehicle within 3 minutes without taking an initial breath test. 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.  

To prevent a driver from having someone else blow into the IID to start a vehicle, and to prevent a driver from drinking while driving, the IID requires the driver to submit to random retests at variable intervals after a driver has passed an initial breath test and started the vehicle.  The IID will signal you to take a retest within a certain amount of time after starting your vehicle.

When certain violations are logged by the IID, when the vehicle is turned off, the IID will not allow the vehicle to start again under any circumstances.  The vehicle would need to be towed to the installer for servicing before you can operate it again.  The violations which result in a permanent lockout state are:

  • If the IID detects tampering, circumvention or bypass attempts.
  • A scheduled service date is missed.
  • Service is not obtained within 5 days of the service reminder.

Some of the above violations will also result in an extension of your RDL requirements.

Costs will vary by manufacturer, installer and type of device.

Yes. 

  • You must install an IID that is equipped with a camera. 
  • if your BAC was .16 or above, you will be required to install a camera-equipped IID with GPS capabilities, and have it in your vehicle for the entire period of time you must operate under the terms and requirements of an RDL.
  • in some cases, the courts or Department of Corrections may require you to install a device that has “Real-Time” reporting” and/or GPS capabilities.

Contact your installer for specific instructions on how to handle this situation.  Depending upon the amount of damage to your vehicle, you may need to obtain a new IID.  Should you have to replace your vehicle, you will need to have a device installed in your new vehicle.  Have the installer complete a Certification of Ignition Interlock Device Installation, VL-082, and return it to this Department.

Prior to selling the vehicle you must have the IID removed by the installer and then installed in your new vehicle.  You will also need to have the installer complete a Certification of Ignition Interlock Device Installation, VL-082, and return it to this Department.

If you remove the IID from your vehicle before you are eligible, we will receive notification from the IID installer/manufacturer, you will be suspended for the remaining term of your original suspension.  A new suspension with a 10-day lead time will be mailed to you.  The lead time and any Departmental processing time will not be counted towards your suspension.

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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IID

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Vermont Department of Motor Vehicles
120 State Street
Montpelier, VT 05603-0001

Monday-Friday: 7:45am-4:30pm
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