According to the Pennsylvania State Police at Jonestown, the crash occurred just before 8:00am in the southbound lanes of Interstate 81 near mile marker 99.8 in Pine Grove Township.
Police say the crash occurred as a Tractor Trailer had slowed in the right lane due to another slowing vehicle.
Ronald Spangler, 54, of Kulpmont struck the rear of the slowing tractor trailer in his Dodge Caravan.
Spangler had become entrapped under the rear bumper of the tractor trailer and sustained fatal injuries. He was pronounced dead at the scene by a member of the Schuylkill County Coroner's office.
Interstate 81 southbound was closed at the Pine Grove Exit for several hours until the scene was investigated and cleared.