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The article does a terrible job at illustrating intent or what actually happened. It's not at all clear what the sign was or what changed.

Articles like this drive me nuts. The entire thing piggy backs off of the video which is shown 75% of the way down.

Weak, low effort journalism.

There is an article? :) I went straight to the video, then jumped around it it to find the payload; it's near the end.

The guy augmented an existing sign with some annotations about the route number and direction.

You can see him working on creating the signage, and then putting it up.

Here is a better article, based off the video and the 99PI episode referenced elsewhere in this thread: