@Carl-Lee said:
I wanted to add this comment in case anyone is offering a solution that is XT2/3 only.
I wish I had solid input to provide you, but I don't. For most of my time on the XT, I didn't use the Drive app. And in my time with the XT3, I have Traffic enabled in Tread, but I haven't run into any road closures. I understand (now) that road closures (as opposed to major traffic jams) trigger an automatic route recalculation. As users, we can't turn this behavior off. From my standpoint it's a terrible design, but Garmin views this as a feature, and not a bug. In any case, I found a great thread on the Zumo User Forums that gets into the guts of it:
https://zumouserforums.co.uk/viewtopic.php?p=17562&hilit=road+closure#p17562
There is a saying that "The best defense is a good offense". In my case, before leaving for a day of riding, I use Google Maps to do a complete scan of the area I'll be traveling for any closures. If you know up front, it's much easier to adjust than dealing with it in real-time. An added benefit is that Google will expose closures that Garmin Traffic Services (or HERE notifications in MRA) don't even know about. I've found out the hard way that Google is the gold standard other sources will never equal. Catch these things early, and life on the road will be happier.