Special Weather Statement issued April 01 at 6:43AM EDT by NWS

…Patchy Dense Freezing Fog along the West River and Connecticut River… Reduced visibilities down to one quarter of mile will impact traveling conditions within the West River and Connecticut River Valleys. As temperatures are below freezing, some icy patches may result. Motorists are urged to travel with care, use low beam

Source: National Weather Service Alerts for Vermont