Seen the same thing last week on the way back from the Smokies, accident shut down 75 north and a lady was walking her dog up and down the road, sat there for about 45 mins till traffic started to move.
That sucks, hope it wasn't too long. I got stuck between tunnels one time on the PA Turnpike, all lanes closed, took almost 5 hours to move again. Took a nice nap in the back of my truck. That day I witnessed a football game in the highway.