The goal with salt is to melt snow and ice.......it works to a certain temp (have no desire to check what that is) but jurisdictions where it is regularly colder than that number don't bother trying to melt the stuff they put sand down which does not melt anything....it just improves traction on top of it.So why can't Toronto do the same? Who cares if it's not cold enough? Salt is horrific. Plus we're digging so much with all the condos that we'll have enough sand for several millennia.
If you have ever walked on a sidewalk in Regina in February you will know the difference.