Refer to Changeset: 155397028 for Part 1. https://www.openstreetmap.org/changeset/155397028

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These two changesets edited no geometry and made the following tag-only modifications:

For way["highway"][~"tiger:"~".*"] in {{geocodeArea:Seattle}}

Removed:

"tiger:cfcc" | 10884 objects
"tiger:county" | 10895 objects
"tiger:name_base" | 10687 objects
"tiger:name_base_1" | 175 objects
"tiger:name_direction_prefix" | 4485 objects
"tiger:name_direction_prefix_1" | 5 objects
"tiger:name_direction_suffix" | 5129 objects
"tiger:name_direction_suffix_1" | 14 objects
"tiger:name_type" | 9967 objects
"tiger:name_type_1" | 33 objects
"tiger:reviewed" | 3014 objects
"tiger:separated" | 2 objects
"tiger:source" | 2 objects
"tiger:tlid" | 2 objects
"tiger:upload_uuid" | 1 objects
"tiger:zip_right" | 3 objects
"source"="tiger_import_dch_v0.6_20070830" | 4 objects
"source"="TIGER;Yahoo! aerial imagery" | 11 objects
"source"="Yahoo,TIGER" | 16 objects
"source"="Yahoo;TIGER;USGS Large Scale Imagery" | 9 objects