After Bruce's comment, i wondered whether it was really the plows or just the grit and regular wear and tear, and it's hard to tell, but.... the roads that get plowed more often are definitely the ones with the least lines but not necessarily the busiest. How often they get plowed depends on who plows them (city, county, township or a combination thereof). And the plows certainly touch the road becasue they spark as they go. But then there is the odd intersection that gets plowed a lot and has heavy traffic and still has most of it's lines. I dunno. Let's just have fun!