As the Tidy Street Project demonstrates, giving hyperlocalized signals to the citizenry gives them the necessary information to modify their behavior for the better.

Instead of doing this for one block for two months, why not do it at scale for the whole city?  Maybe by creating a parameterized actionboard (an actionable dashboard) that citizens can always refer to, and can even be displayed as Neighborhood Service Announcements (hyperlocalized Public Service Announcements) at the corner DW?

And even celebrate blocks that top the rankings, giving a  feedback loop to local residents.