I had exactly the same feeling as the author, perhaps a month or six weeks later. I drove from Tennessee to Massachusetts, and for most of the way, I saw only Trump signs. Yes, there were some HRC signs around big cities, and of course, back in MA. But, for 1000 miles, it was almost all Trump.
My wife, an ABH voter (Anybody But Her), was pessimistic. I didn’t know what would happen in the election, but I told her that it was obvious from the signs we were seeing that DJT was going to do much better than the media and pollsters were saying, and that at the worst, it would be close. (We were both happy that we got better than a losing close, of course.)
Yeah, the author took a look outside her bubble. Good for her.
When I would drive around the San Francisco Bay Area there sparse numbers of Hillary signs.
The second you approached rural areas just 20 minutes south of San Jose and anywhere in the valley(Fresno, Madera, etc) the Trump signs were numerous and Yuge!
Stopped at a restaurant on the outskirts of SlackRuhDemento and everyone was wearing MAGA hats.
In fact, one guy gave me one, which I squirreled away with my other hats....