Why do the lights flash and the horn blow if I fail a “random retest”, or if I do not provide a breath test during the “random retest”?

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.


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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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