Drying Clothes Outside Below Freezing It is commonly accepted that you can hang your wet clothes outside to dry even when the winter temperature is below freezing. It is mentioned here
http://grist.org/living/ask-umbra-can-i-line-dry-my-clothes-in-the-winter-too/
that water in the clothes will freeze to ice, then sublimate into water vapor, making the clothes dry.

Question: Why does the ice in the clothing sublimate, while the ice on the roads don't sublimate? Why is there a difference between what happens to ice on the clothing versus ice on the roads?
As long as there is less than 100% relative humidity, the ice will sublime to some extent.

Just in the past week it has been in the -12 °C to -5 °C range in my area, and the snow and ice on the ground did sublime, on the order of 1 cm per day, more in the sun less in the shade. 

For quantitative information see "Sublimation from a seasonal snowpack at a continental,
mid-latitude alpine site" Hydrol. Process. 13, 1781-1797 (1999).