The National Weather Service issued a dense fog advisory Thursday morning for most of Northeast Kansas.
Counties affected include Douglas, Leavenworth, Wyandote, Jefferson, Franklin, Shawnee and Johnson, among others.
The advisory is in effect until 9 a.m. and drivers between Kansas City and Lawrence were reporting visibility as low as 100 yards or less. According to the National Weather Service, a dense fog advisory is issued when visibility will be a quarter-mile or less.
Visibility is expected to improve through the morning, the weather service said.
Motorists should drive with extreme caution and allow additional travel time; use low beams and reduce their driving speeds, the weather said. The weather service also urged motorists to slow down and drive defensively, leaving plenty of room between you and other cars.