I've seen these kinds of sidewalk street markers in a handful of other cities and I've always thought it was a really cool idea. Looks like someone had the same idea in Indianapolis a while ago, though they didn't get very far with it. They're not exactly the same, but for some reason they remind me of old-school, tiled New York
subway signs.
All of these signs are in the area around Fall Creek Pkwy. and 24th/25th Sts.






This last photo shows a sidewalk sign in relation to the intersection (strangely, the signs are oriented so you have your back to the street in order to read the street name). You'll also notice another example of those old
Indianapolis curbs.
I should mention that I originally noticed these signs while I was on my "
Bike Life" experiment last month. It's amazing what you'll notice around this city when you get out of your car.