Hello PedestrianMapping_HopMapper, I've partially reverted this changeset (as well as 169050380, 168908129, 168906355, 168906228, 168905595, and 168905269) with changeset 170228832 due to some strange changes of sidewalk geometry and incorrect modification of surface tags. I tried to leave the correct changes intact.

I understand this is part of an organized editing project by Meta. I've reviewed https://tasks.openstreetmap.us/projects/869 https://maproulette.org/challenge/51162/task/294635175 and https://wiki.openstreetmap.org/wiki/Organised_Editing/Activities/Meta/Pedestrian_Mapping but can't quite make out what's going on here. I'd love to know:
 - Why are these challenges being created in particular spots (what's a "complex intersection"?)
 - What observations will trigger a change, and what are the recommended changes?
 - What are the procedures for task validation?

Thanks, jmapb