Where do you think the gritter drivers live? In some special underground bunker that isnt affected by weather? Why dont you think the busses can get on some of their routes? Incase no-one has ever seen the gritters the grit comes out the BACK of them and doesnt melt the ice instantly. What do the gritters drive on then? Is it not the same roads as the busses?
** cough ** Snowchains ? ** cough **