Beet juice. It makes salt work at a lower temperature and less salt is needed when beet juice is added.
https://www.modot.org/tools-tackling-winter-weather#:~:text=The unassuming sugar beet makes,icy or snow-packed surfaces.&text=The sugar beet is of,well as feed for cattle.
Beet juice has been proven to lessen the corrosive properties of the salt that we use to apply to the roads.