so where did it go?

I do a fair bit of driving in and around San Diego, and while it is quite often a challenge to do so without being run over by some crazed lunatic on the road (more often than not, with Mexico tags), I do tend to notice stupid little things at the same time. Of course, I tend to notice stupid little things regardless. One such thing was a sign by the side of the road (though I have seen more than one instance of it, over the past few months) – the standard orange-background, black-font sign you see at construction sites around the country. I wish I could have gotten a picture of it, but they are always located in places that it would be difficult/dangerous to stop.
Well, simply put, the signs read “End Landscape”.
If that is the case, then I have two questions. First, where did it start? And second, what am I driving on now?