Swerving off topic slightly, regarding putting grit/salt down.
I am unsure what is best to do, I did a place on thursday and left a row of about 8-10 quite steep old stone steps covered in water, I swept them off best i could, But I was worried all night if they had frozen,I had visions of the home owner slipping down them and smacking their head!!
Now if i put grit down I am admitting responsability, also they would be walking it into their homes.
Another equally big concern is on concete or even old stone, The grit can damage the surface and the top layers start breaking off. This happened to me on my own rented place last year, and also at my mates mums, whos path and drive I gritted for her using grit out of the grit bin near by.