Flyposting is illegal. Google Maps pins and AR anchors are not.
Cognitive cities require the approval and collaboration of city authorities. The same people who make flyposting illegal.
Spirit roads were overlaid on folkloric paths believed to be travelled by ghosts. It seems oddly apt to me, here in our hauntological future condition, that we might superimpose ghost traffic on our real roads.
Opening the streets to spectral detournements, applying digital sandpaper to the real world, and the fictions of ARGs, Alternate Reality Games. Pirate broadcasting from the husks of old buildings again, like those Essex nutters sending pictures to televisions at four in the morning.
Mediated by ghost boxes, enabling near field instrumental trans-communication with the world of the invisible. Electric scrying pools, a glowing screen for conversation with the voices of the other side.