When I myself was a kid, I read the Ramona books by Beverly Cleary, set in Portland, Oregon. In one book, she told her dad that she wanted to stand on the middle of the Interstate Bridge with her arms stretched out, one in Oregon and one in Washington. That's a very kid thing to do; I myself was and am interested in state and international borders. However, her dad dissuaded her of that notion, saying the bridge is on an Interstate highway, and is closed to pedestrians. When I finally went over the bridge, I saw that it has a sidewalk, and later I was able to walk over it myself. It's an old bridge, so it's likely it was open back when the book was being written. Either this is a lapse in research, or a "character error". Perhaps the dad really didn't know the bridge was open to pedestrians, or he didn't want to bother to drive out there and then walk several long minutes with traffic roaring right by you. I walked out there to take a picture of an unusual sign that I'm posting over on the Good, Bad and Ugly thread over in Traffic Control.