Thanks for reverting the edits. Aplogies for the delay in the response and will ensure that these are addressed on priority.
We have looked into the changeset and could identify that the mapper has missed on adding the traffic signals while creating the Carriage Way on this segment.

To address the second part of the query, the Amazon OSM wiki page currently has the outdated list of  editors and reviewers, due to the restriction of updating the lists it wasn't addressed in the past and put on hold. The team will rework on the issue and update the Amazon users list by 03/31.