According to the Pennsylvania State Police at Frackville, on Tuesday, around 2:00pm, the northbound passing lane on Interstate 81 near Milemarker 129.1 was closed due to a earlier crash.
A State Trooper had set up a flare pattern and was attending to the scene prior to the arrival of crash investigators.
Traffic approaching the scene began to slow as it merged into the right lane.
A vehicle driven by John McNulty, 76, of Clarks Summit was travelling in the right lane and began to slow due to traffic ahead.
A tractor trailer driven by Steve Chamberlin, 50, of Tellico Plains, TN was traveling behind McNulty.
Chamberlain failed to slow down and swerved into the passing lane striking the rear of McNulty's vehicle.
The tractor trailer then ran over the flare pattern in the closed lane forcing the State Trooper attending to the scene to flee for safety over the guiderail.
No injuries were reported and both vehicles were able to be driven from the scene.
Chamberlain will be cited for careless driving for the incident.