Bus routes can be fixed in the sense that they can stay in place for decades. Even simple things like paint, signs, and shelters provide psychological permanence.
Things like WalkScore show up on real estate listings as a value add.
You don't even need that. Just seeing the bus go by "all the time" provides permanence. Really it is better, I've seen plenty of paint/signs/shelters, but when I bothered to look the bus only came rarely. When I moved someplace where I saw buses all the time I realized I could use them even though there was no paint/sign/shelter close to where I got on.
Things like WalkScore show up on real estate listings as a value add.