Ah, a map-inspired wikispiral leads to this entry on “Trap Streets”:
“A trap street is a fictitious entry in the form of a misrepresented street on a map, often outside the area the map nominally covers, for the purpose of ‘trapping’ potential copyright violators of the map who, if caught, would be unable to explain the inclusion of the ‘trap street’ on their map as innocent. On maps that are not of streets, other ‘copyright trap’ features (such as nonexistent towns or mountains with the wrong elevations) may be inserted or altered for the same purpose.”
Rad. It’s like a “What If?” episode where John Ashbery became a cartographer instead of a poet.