Wiktionary
road salt
n. Salt used for deicing and anti-icing of roads.
Wikipedia
Road Salt
Road Salt is a song written by Daniel Gildenlöw, and performed by Pain of Salvation in the first semifinal of Melodifestivalen 2010 in Örnsköldsvik, from where it made it to Andra chansen before getting knocked out of contest. The band also recorded the song on the album Road Salt One.
During Melodifestivalen 2012, the song appeared at " Tredje chansen".