Image by Flickr user davesag
A lot is the same as usual, and all lanes of I-26 will still point to Columbia. Different is that buses won't take folks to local shelters but during a big storm will take those who can't drive out themselves to the Charleston Area Convention Center to have them board charter buses to Columbia.
Also new: Pet's are welcome.
The Post and Courier has a nice rundown about how all this would work.
If you're interested in how to drive out, here's South Carolina's evacuation routes and lane reversals.
Read more stories on this subject in our hurricane topic page.