They're popping up everywhere, and they're not all legal — billboards, digital signs, and so-called "super graphics," which cover entire buildings. Thousands of these illegal billboards have sprung up in Los Angeles, but city officials have been either unwilling or unable to enforce their own ban. Watch the full series below, and check out the extra reports, updates and opinion that accompany it.

Producer's Notes
Behind the Billboards
Now that I've done a story on billboards, I can no longer drive down the street without noticing them — big ones, small ones, bright ones, ugly ones.