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South Dakota roads may look merely damp this morning, but a thin, nearly invisible hazard is making travel risky across the region. Pavement frost has formed in spots along and east of Interstate 29, creating slick conditions just as fog begins to thin.
According to the National Weather Service in Sioux Falls, dense fog is slowly eroding, but temperatures remain below freezing, allowing moisture to freeze directly onto road surfaces. This setup is especially common during calm winter mornings when cold pavement meets moist air…