Wet roads without a drop of rain?

We have not had a drop of rain, but the roads have been damp and even downright wet. Warmer air with moisture is moving north from the Gulf of Mexico, increasing the humidity to more than 90 percent, and this is creates something interesting. When this humid air moves over the cold, salt covered pavement, the moisture will condense, causing the roads to sort of sweat — making it look like it rained.