Pennsylvania’s Ignition Interlock Law requires an individual convicted of a second or subsequent
offense of driving under the influence to have an approved ignition interlock system installed on each
motor vehicle they own, operate, or lease for one year before they are eligible to apply for an
unrestricted driver’s license. If the second or subsequent DUI offense occurred prior to 6/30/07, any
prior DUI offense will result in ignition interlock being required. If the DUI offense occurred on or after
6/30/07, only DUI offenses that occurred during the previous ten years will be considered for Ignition
Interlock purposes. Example: You had a DUI on 6/25/95 and receive your second DUI on 6/29/07;
you would be required to install an Ignition Interlock device. You had a DUI on 6/25/95 and receive
your second DUI on 6/30/07; you would not be required to have a device installed because your
previous DUI is greater than 10 years..
What is Ignition Interlock?
Ignition interlock is a device that is installed on motor vehicles to prohibit individuals under the
influence of alcohol from operating the vehicle. Individuals are required to blow into the device before
starting the vehicle. If the device detects alcohol, it will prevent the vehicle from starting. In addition,
at periodic times during the operation of the vehicle, the driver will be prompted to blow into the device
to ensure they are not under the influence.
Applying for an Ignition Interlock System/License
Thirty days prior to an individual’s restoration eligibility date, PennDOT will mail the individual a
Restoration Requirements Letter. This letter includes an application for the Ignition Interlock License
and a list of ignition interlock providers. The person should complete the application for the Ignition
Interlock License and send it to PennDOT immediately. The fee for an Ignition Interlock License varies.
Ignition Interlock Licenses have a red banner that contain the words
“Limited License”. The red map of Pennsylvania in the lower rig