DULUTH, MN (KDAL) - The heavy snow last week coupled with the bitter cold temperatures ever since have made icy roads a continuing problem in Duluth and surrounding areas. Any wet snow that was not removed from the streets before freezing has turned to ice and has left many streets and intersections very slippery. The problem is the cold snap that followed the storm and is keeping road salt from being able to melt the ice. Salt is not effective at temperatures of 15 degrees or less and the area hasn't been anywhere near that warm since the snow ended last Thursday. In a message on his Facebook page, Duluth Mayor Don Ness says city trucks have been spreading sand to help with traction but that has only limited success. The mayor says until warmer weather returns, drive slower, ease into stops and be a defensive driver. Both Duluth and Superior have reported accidents caused by drivers going too fast for the slippery conditions.