When did Pond Street get reclassified as a Double Yellow Road?

Glad to see the lines on Pond Street were repainted, BUT, when/why was the road reclassified as a double yellow line road? If you look at photos from earlier this year (below) you will see that Pond has been a single yellow line road (as recently as April 20th). And, you'll notice that when you cross into Woburn, it becomes single yellow again.

The double yellow line gives drivers the impression that Pond is a higher volume/higher speed road than it is. I have also heard that home appraisers value homes on roads with double yellow lines less than with single yellow so (if true) there are real economic damages as well as the safety issues. I imagine that that the line reclassification was a mistake rather than a conscious decision to make the road feel like more of a highway (Note that no notice of this change was given to Pond Street residents).

I also should note that the new lines are a little premature considering that the Board of Selectmen are considering "re-striping" to add a bike (or parking) lane as part of traffic calming measures.

I don't want to be too critical, but would prefer to see the paint go to the missing crosswalk across Chesterford at Pond Street and hold off on making new "line policy" particularly when that policy (line locations) is under consideration for change.