Hi Kate,
Thanks for responding. I started a thread on the OSMUS Slack asking for opinions on this change: https://osmus.slack.com/archives/C2VJAJCS0/p1703005593240569. The consensus among US mappers in that forum agreed with your assessment that lanes=2 is OK in this situation if paired with lane_markings=no, also agreeing with the guidance you pointed out on the wiki. In light of that, I drop my opposition to you adding lanes=2 to roads similar to this, but ask that in future similar changes you add lane_markings=no as well to more explicitly characterize the situation.

As an aside, at least in this area, the department of transportation tends to add such markings all at once, or at least within a couple weeks of eachother. Given the imagery is more than a year old at this point, I doubt lane dividers will be added in the future.

Happy mapping and happy new year,
Will