Watch Out!
This is another great example of using the elements around you to make something cool. It looks like those doors were already tagged with something, which makes the piece feel more a part of the environment.
Maybe It's Time To Repaint the Crosswalk
If something needs to get fixed, bring attention to it! Crosswalks are super important in urban areas, and keeping them up to date is crucial. This city totally dropped the ball, and a street artist decided to bring some attention to it. Since it's "tagged" the city is more than likely to redo the entire crosswalk than to just get rid of the art.