Cars have already been sliding in the ditch, but for the most part, motorists have been heeding the warnings about the seriousness of this storm. Minnehaha County Sheriff's deputies have been responding to fewer than average traffic-related calls. Still, you don't have to travel far to see a big change in conditions.

Snow has been blowing across the icy roads as we head north on Cliff Avenue between Sioux Falls and Renner.

"It looked like the road was pretty dry, but as we get amongst some shelter belts and houses the snow kind of sticks to the road a little bit more and there's a little shine on the road, maybe a little bit slipperier than it was just back even a quarter mile," said Pete Jaros with the Minnehaha County Sheriff's Department.

Bridges are favorite places for the snow to start drifting. As we head back into Sioux Falls, we spot a car that went into the ditch along Westport Avenue. Drivers who don't reduce their speeds in conditions like this are likely candidates to skid off the pavement.

"If somebody tries to pass, or they're going a little too fast and they come along a curve or a bridge where things change, they're going to slide in the ditch if they continue to go the speed they were going," said Jaros.

Authorities have been worried that the lull before the storm will give drivers a false sense of security when they're on the road. But what looks driveable in the city, can be downright dangerous in the country.

The Minnehaha County Sheriff's Department will call in deputies as needed when weather conditions change. They'll also be assigned to certain towns in the county to avoid long drives in the weather.