ARDMORE, Okla.  (KTEN)  — The Oklahoma Department of Transportation reports severe driving conditions in most of southern Oklahoma. 

Interstate 35 was narrowed to one northbound lane in Ardmore near mile marker 32 due to a crash Wednesday afternoon. 

"There are a lot of slick and icy conditions out there, and we are really cautioning drivers against traveling unless absolutely necessary,” said ODOT public information officer Cody Boyd. ”If they do need to get out, then drive very slowly and very cautiously." 

Road conditions led to several crashes throughout the day.  No major injuries were reported, as of Wednesday afternoon. 

ODOT expects severe conditions to stick around. 

"With overnight hours and such low temperatures, we know are going to drop even more, and anything that got wet during the day is going to be frozen really solid and slick," Boyd said. 

Crews started preparing for the storm Tuesday. 

"Our workers work 12-hour shifts, so we always have trucks running around the clock, until we have everything cleared and our highways are drying, but that could be a little while with such low temperatures," Boyd said. 

The Oklahoma Highway Patrol encourages anyone who must  drive to bundle up with lots of layers in case your vehicle gets stuck and you have to wait for assistance in freezing temperatures. 

Ardmore Public Works crews also spent the day sanding and de-icing roads and are prepared to continue when the second wave of the winter storm strikes.