There are few things that signal the coming of spring, like the great Canadian pothole. With a near non-stop cycle of freeze and thaw in Ottawa this year, driving has been particularly challenging. Friends and I swap stories of the worst potholes with each other and put them on our "avoid" list. We are basically housebound until June now. Potholes are such an accepted part of living in Canada, that many of us aren't even aware of the damage they do to our cars. Kaltire recently surveyed 1000 …