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...We have a limitless supply and even though it would need transporting...
I hate salt on the roads. It corrodes bicycle chains. In Nordic countries people put chains round their car tyres to get more grip on icy roads.
The amount of salt they use should depend on the depth of snow and the ambient temperature.Seawater freezes at about -2C (it depends what sea you get it from).Since it's quite often colder than that the seawater simply wouldn't work (unless you heated it).