In extreme weather, can I go start my car and let it run with the heater or air conditioner on, until the car warms up or cools down?

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.

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IID

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

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