Earl and
HossC, thanks for your opinions on the photo. For what it's worth, a couple other people I've asked about this photo think it is snow.
A couple things for argument's sake, what is making the marks in the road that cars have traveled over. There's definitely some reason for the dark areas where the tires have driven over and the light areas that weren't.
Also, look at where the P.E. tracks are below the car that's at center left. Doesn't that look like something, whatever it is, is pushed out into the road?