Look what treasures the internet contains – photos of all the rest areas along I 90 in South Dakota. What a wonderful resource, huh?
For example, if you see this rest area, you know you are at exit 296.
But if the exit looks like this, you are at exit 264. See the difference?
Now driving farther west, you might see an exit looking like this.
Quick, where are you? Exit 218 or exit 100? Answer here*
* It is obviously exit 218 because exit 100 looks like this.