KPBS: "...blocked by a disabled vehicle. Apparently, it lost its tire, which was last seen bouncing around on the freeway..." Awesome.

Which spurs today's report from ther Grammar Police: its, it's, it is. It's a simple rule, really: its is the possessive form of it. It's is a contracted form of it is or it has. For examples, see Fowler's Modern English Usage (Rev. 3d ed. 1998):
its: ("The cat licked its paws")
it's: ("It's raining again")
it's: ("It has come")
Summary: if you are not using/contracting two words, don't put in a goddamn apostrophe: it's not needed.