When a street is flagged, it goes into a list that I can browse through to either delete or fix. I’m trying to work through the list, but there are over 4,000 flagged streets right now. 
There’s a bit of a discussion on the issue of this moderation system here.
I hope to work towards fixing this two ways:
- Set aside a certain amount of time each week to work through the flagged streets.
- Improve my city import process so that less junk data gets brought in.