After doing some more looking around on VDOT's ArcGIS map, I'm a bit confused about something.
Google Maps and VDOT's Dickenson County traffic logs (which are known for their unreliability) show VA 80 as transitioning to KY 80 at the state line near Breaks Interstate Park, which is what the VA Hwys Project and Wikipedia both say.
The VDOT ArcGIS map routes VA 80 onto SR 693 (Breaks Park Rd), ending at an orphaned segment of US 460 connecting to the new expressway alignment of US 460 being built in Kentucky, rather than at the state line. That segment is actually labeled as part of US 460 along with the existing US 460 that enters Kentucky in Buchanan County. This results in a discontinuous VA/KY 80. The portion of VA 80 that runs from Breaks Interstate Park to the state line is labeled as an extended SR 768.
The strange thing is I can't find out when (or if, for that matter) this happened. I don't see anything in the CTB archives that suggests a rerouting was approved.
Having driven through here a number of times while the construction was ongoing, perhaps I can give some insight.
Coming from Kentucky, VA 80 climbed a slight hill just prior to where the new bridge crosses the road as shown now, and the grade ended up on where the connector is. When work started on the bridge, VA 80 was signed with a detour along the secondary route that goes through the community of Breaks, then tied into SR 609, turned right, then left onto the previous alignment of VA 80 going toward the main entrance to the park and Haysi. You can see evidence of this on satellite view.
The connector road shown on Google Maps as SR 693 is signed as US 460.
Part of this may hinge on how Kentucky signs the old route once the new Corridor Q link between Elkhorn City and Marrowbone is completed. Currently, the new route is signed as two discontinuous segments of KY 3174. US 460/KY 80 remain signed on the old route from Shelbiana (the split from US 23/119) to Belcher, where KY 80 continues to Elkhorn City and US 460 runs along its current alignment to Mouthcard and on to Grundy.
If Kentucky puts US 460 and KY 80 on the new Corridor Q routing, then it would be logical for VA 80 to run along the new connector. However, if Kentucky keeps KY 80 on the old road, and Virginia routes VA 80 on the new connector from Breaks to the four-lane, the route will no longer be a multi-state route.
The Virginia map may be predicated on anticipation that Kentucky will sign both US 460 and KY 80 on the completed Corridor Q.