I have another question about which U.S. Highway followed Interstate 85 through the city of Greenville, South Carolina? I have a new Greenville, SC map in my collection of old street and road maps as of now, and I was curious about this route.
I-85 parallels the US 29 corridor in South Carolina and it replaced US 29 directly from SC 129 to the NC Line (via what is now I-85 Bus through Spartanburg). US 29 was returned to its original routing for that long segment.
I'm about 75% done with a revamp that I started in 2015 which has not reached the US routes or interstates yet, but basic information about those as well as detailed information about the state highway system can be found here - http://www.vahighways.com/scannex/route-log/index.htm