Was looking at US 129's northern terninus in AAMaps and noticed the dashed under-construction lines near McGhee-Tyson Airport.
Not sure if there's a thread on this already but did find more info on the project here:
https://www.hwlochner.com/projects/sr-115-us-129-alcoa-highway-relocation-and-reconstruction-hall-road-sr-35-to-little-river/
And here:
https://www.tn.gov/tdot/projects/projects-region-1/sr115-us-129-alcoa-highway.html
Some of the right-of-way grading can be seen southwest of I-140
https://www.google.com/maps/place/Knoxville,+TN/@35.8276694,-83.9754444,2551m/data=!3m1!1e3!4m6!3m5!1s0x885c162246ce42a9:0x7bea92dac4f534c5!8m2!3d35.9606384!4d-83.9207392!16zL20vMF92bjc?entry=ttu&g_ep=EgoyMDI0MTIwNC4wIKXMDSoASAFQAw%3D%3D
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Video diagram from local media
I did add a section in 2022 on the realignment of U.S. 129 to the write-up for Interstate 140 (https://www.aaroads.com/interstate-guide/i-140-tn/) on Interstate-Guide. The project includes a new systems interchange:
(https://www.aaroads.com/interstate-guide/wp-content/uploads/routes/140/i-140-tn-162-us-129-interchange.jpg) (https://www.aaroads.com/interstate-guide/wp-content/uploads/routes/140/i-140-tn-162-us-129-interchange.jpg)