Amusingly, I came across this diary entry of yours because you incorrectly changed a section of street in my neighborhood to one way. (changeset 21194602). The street was changed to two way 18 months ago, so you are working from old aerial photos.

I do realize that the vast majority of streets you are changing to one-way aren’t going to have actually been changed in the last year or two, but it’s something to keep in mind.