Road vapors

On my second visit to Utah's ski areas, in April of 1984, I was struck to see the roadways literally “smoking” just after one of these late spring snow showers. It was incredible and something that I had never seen before, particularly in the Alps, where I had spent most of my life. A few days ago, my wife noticed the same phenomenon as we were in the middle of some raging flurries and the black, warm asphalt was erupting with water vapors.

I didn't have the sense of taking a picture then, but wanted to better understand what was causing this sudden eruption. As usual, I try to research what I had just seen but couldn't find any explanation anywhere I had looked. I would think that it is cause by a “perfect storm” of conditions involving the right mix of air moisture, salt on the road, ambient temperature and asphalt heat. Is there someone out there who could explain the real reason behind this uncanny observation?