Special Weather Statement issued November 29 at 3:26AM EST by NWS

…Black Ice Expected Across Parts Of The North Country… Pockets of light freezing drizzle will continue across northern New York and Vermont through the mid morning hours today. This has led to the formation of black ice in some spots…especially on secondary and untreated roads. Be aware travel conditions can change quickly when encountering these pockets of freezing

Source: National Weather Service Alerts for Vermont