There is still oncoming traffic, particularly a lot of fuel and supply trucks. They are allowing people to drive on the shoulders now, turning the two lane turnpike into a four lane road.
Once they stop bringing in supplies they will do contraflow for awhile to try and clear as many people as possible. The governor stated this morning that they are waiting on that because they need supplies, especially gas, and emergency vehicle access.
The two biggest creators of stopped traffic yersterday were accidents and lines at the service plazas backing up onto the traffic lanes. People are exhausted and stressed so accidents are more likely. Anything folks can do not to create more traffic havoc is a pretty good idea.