South Dakota has opened the closed portions of Interstate 90 and Interstate 29 in both directions.

Interstate 90 was previously closed from Rapid City to Mitchell for eastbound traffic and from Mitchell to Wall for westbound traffic. Interstate 29 was closed in both directions from Watertown to the North Dakota border.

Officials are advising motorists that even though the interstate is open, driving conditions are still difficult throughout much of the state. Roadways across the state are ice covered, snow-packed and slippery and continue to experience drifting in open areas, and at bridge ends and overpasses.

Travelers today are asked to use extreme caution, take your time, reduce speed, avoid distractions, wear your seat belt, keep the cruise off, be prepared for changing conditions, and allow extra space between you and the car in front of you. Be especially cautious around bridge ends and overpasses. Travelers are advised that up-to-date road conditions can be obtained by calling 5-1-1 or visiting

The South Dakota Department of Transportation said snowplow crews are out working and motorists are reminded plows travel at 25 mph or less and to stay eight car lengths behind the plow to allow ample stopping time on icy roadways.