Sorry to bump an old thread, but I was finally on the section of I-75 that is covered by the first phase of this work, on Friday. It runs from about MM 69 to about MM 64. At this point, the only inconveniences are a drop in speed limit to 55, a lane shift to the right in both directions, slightly narrower lanes, and basically no right shoulder. The roadway itself was widened years ago, so no blasting has to be done now. So far there are no lane closures. They're already grading and laying some road surface. If there are any lane closures, it will probably be when the surface is done and they need to re-stripe it, but that can be done overnight and probably for a short time, as short as this section is. They have not begun on the other phases from MM 64 down to about MM 52, but they will probably be done in the same relatively low impact fashion. I never did hear of any major backups in this area during spring break.
Except that it's costing more money to come back and add a lane to the previously widened roadway (they should have added the 3rd lane at the time the roadway was widened - it would have cost less), this project seems to be inconveniencing drivers only a little for a long-term fantastic improvement. This section of I-75 is one of the longest stretches of 2-lane (in each direction) still remaining in Kentucky (and possibly Tennessee).