The cardboard sign has since been ripped down. It said:
"Dear Friends, has this white stroller been placed here as a memorial to a chile who lost their life on this street? if so, please add a plaque with the child's name and dates so that we may share your courage and your grief. If not, please remove this stroller. It's similarity to the white "ghost bikes" and it's implications are disturbing and unwelcome. Thanks you!"