Pity the poor pothole, maligned by motorists for years. Who ever heard of a casting?
But it turns out that castings — public works jargon for manhole covers, grates, and other cast-metal lids, as well as the rims on which they sit — are responsible for about eight times as many bumps and divots in the road as plain old potholes.

Comments
these "castings" have always been the worst problem. So very often, when a street gets resurfaced, the castings are left below the level of the street, and are horrible on my old van. But they are expensive to fix, and then they start falling again, especially in soft earth parts of the city like the Fenway.