WICHITA, Kan. -

A lingering cold snap and fresh snow has contributed to icy roads for Wichita drivers for a week, city officials said.

The latest winter storm brought more than four inches of snow into the area Sunday night into Monday morning. The snow fell on top of icy roads from a Feb. 4 storm.

Joe Pajor, deputy director to public works and utilities, said crews continue to work 12 hour shifts. Last week's extreme cold created difficult conditions for melting any remaining snow on the pavement. 

"Salt is 89 percent less effective at 10 degrees than when the temperature is at 30 degrees," Pajor said.

The city is operating on one-third of salt supplies. Orders for 3,000 tons of salt were placed in December, but national demand has limited deliveries since that time.

The city has contracted with Mies Construction to bring an additional 125 tons of salt per day.

Crews have been applying a salt and sand mix treatment that Pajor said should begin to clear the roads in the next couple of days.