That section of 95 has sudden back-ups with stop-and-go traffic which can stretch for miles. There is usually no apparent cause for them, like an accident, road work, or a breakdown. They just seem to perpetuate and amplify spontaneously as traffic coils and uncoils. It may be that adjusting the traffic flow approaching one of theses clogs will help. I think that’s what they are trying to do.
The cause is usually some moron trying to merge onto the highway at 35MPH.