Hi,
It looks like you're upgrading minor residential roads with centerlines to tertiary. While this was historically how these were tagged in the US, the community has recently started shifting away from using just physical characteristics and prioritizing connectivity when determining highway classifications (https://wiki.openstreetmap.org/wiki/United_States/Highway_classification).

Instead, I recommend using lane_markings=yes to show that these roads have centerlines (https://wiki.openstreetmap.org/wiki/Key:lane_markings)