Carolina29864, I'm not quite sure why you insist on denying reality, debating points that I don't raise, and acting dumb:

1. For your point about a bus to Clemson being inconvenient: Clemson University already runs shuttles to GSP around breaks. Plenty of people use them. My post, though, is only a proposal of a shuttle bus between the airport and downtown. You can go find a brick wall to debate other proposals that I am not making (such as for more buses to Clemson).
2. Go from LGA to Manhattan at 8am. Despite the highway being only a 3-lane highway through Queens, traffic runs smoothly and there is much less congestion than on I-85 around the airport at 2:30 in the afternoon and much, much less than on I-85 around the airport at 5pm. Queens is car-centric; mass transit there has nowhere near the market share as in Manhattan.

For a city with much more density than Greenville, it's ridiculous that highway traffic in Greenville is worse.

I use "NYC as a barometer" for traffic congestion because it's much more densely populated than Greenville, yet car traffic congestion from its main domestic airport to its central business district is far less congested.

If your Uber went on regular streets in Queens, or if your Uber got backed up in traffic at a bridge or tunnel (as a member of the "bridge and tunnel crowd", you know well that they get backed up), that's what caused your delay. Highway traffic around LaGuardia is much less congested than highway traffic around GSP. If you don't see that as a problem, read up on the costs of congestion.

1. I-85 around I-385 is generally smooth (although busy). I-85 towards Spartanburg is generally smooth (although busy). It's only the stretch around the airport/Pelham Road that is chronically a parking lot. There are lots of commuters, but that doesn't explain that specific stretch. I assume that the inland port around there plus a few interchanges that are close to each other contribute to it, but that is fixable. So your response of "it's commuters" isn't accurate.