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This is an old revision of this page, as edited by Pburka (talk | contribs) at 15:59, 17 September 2005 (Ignition interlock moved to Breath alcohol ignition interlock device). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

An ignition interlock is a breathalyzer installed into a car that will not allow the car to start until given a breath sample that has a lower Breath Alcohol Content(BAC) than the ignition interlock has programmed into it.

At random times after the engine has been started the ignition interlock will require another breath sample. If the breath sample isn't provided or the sample provided exceeds the ignition interlock's preset BAC level it will log the event, warn the driver and then start up a specific alarm system (e.g., lights flashing, horn honking, etc.) until the ignition is turned off.

Many countries have or are adding the ignition interlock as a penalty for drivers convicted of driving under the influence, especially repeat offenders.

also known as an IID or BAIID.

Modern ignition interlock devices use an ethanol-specific fuel cell for a sensor, limiting what may be read as alcohol. The fuel cell creates a current when it comes into contact with alcohol on the user's breath, which is then analyzed by the computerized portion of the device. If the reading is too high, the interlocked vehicle will not start.

Modern interlock devices keep a record of the activity on the device and the interlocked vehicle's electrical system. This record, or log, is printed out or downloaded each time the device's sensors are calibrated, most often at 30, 60, or 90 day intervals. Authorities may require periodic review of the log. If violations are detected, then additional sanctions can be implemented.

Calibration is performed using either a pressurized alcohol/gas mixture at a known alcohol concentration, or with an alcohol wet bath arrangement that contains a known alcohol soultion.

A common misconception is that interlock devices will "turn off" vehicles if alcohol is detected, thereby creating an unsafe driving situation. This is not true, as interlock manufacturers would have difficulty obtaining liability insurance.

External links

• Ontario Ministry of Transportation: Ignition Interlock
• FloridaIgnition Interlock Program
• MADD: Ignition Interlock - Issue Brief

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