Wiktionary
n. A mixture of grit and salt (often calcium chloride) spread on the surface of roads to prevent the formation of ice during cold, damp weather
Usage examples of "road grit".
The other thralls fared little better, save perhaps for Teyle, who was tall enough to avoid ingesting much of the disturbed road grit.
The road grit settled, then leaped into swirling motion once more.
Her hair felt like it had crawled through a swamp, then been powdered with dust, and her eyes burned from the road grit.
He blinked, trying to rid his eyes of the road grit that made the torches brandished by the distant Lirwanis seem ringed.
Dana knew there would be road grit and dust from the cinders of the wounded Earth to wash from her hair later, but she didn't care.
He wiped off some of the road grit which had clung to the stubble on his face.