alt Hacker NewsBecause the goal is to get the road surface exposed so it'll heat up and melt off the snow during the day. And then the residual salt will leave a residue which will help prevent refreezing.
Because the goal is to get the road surface exposed so it'll heat up and melt off the snow during the day. And then the residual salt will leave a residue which will help prevent refreezing.
That only works in places with relatively milder winter climates. In harsher climates, salt stops melting snow, and the surface temperature of even exposed road may stay below freezing even during the day.