This infographic summarizes how many people are expected to travel to the path of totality and where they will congregate. The patterns of converging lines to the path of totality represent the quickest drive paths from throughout the nation to the path. These lines are color-coded by destination state. The blue circles in the path are destinations for eclipse travelers, proportionally sized to the expected traffic impact. The black dots are metropolitan areas throughout the country scaled to population.
This traffic shed diagram is interesting on so many levels. You can imagine what the congestion points might be on day of with an extra 2 million people trying to get around South Carolina.
It will also be interesting as the media starts ramping up as we get closer if more folks will decide to take this plunge, or figure that they'll be around in 7 years to catch the next one.