Glossary term

Ignition interlock device (IID)

Ignition interlock device (IID): A breath-alcohol testing unit wired to a vehicle's ignition, required after a DUI in most states. It does not directly affect the insurance premium but is often a condition of holding a licence.

Where this term matters

Guides and entries on this site that use the term.

Guide

Ignition Interlock Devices and Car Insurance

How an ignition interlock requirement interacts with your insurance: disclosure, installation, cost, restricted licences and whether it affects your premium.

Related terms

DUI (Driving Under the Influence)

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