The southbound trailer lost control and ended up in the northbound lanes, where it struck another tractor trailer and three other vehicles head-on, around 11 a.m. near the Saylorsburg exit, police said in a statement.
A driver and front-seat passenger were pronounced dead at the scene, while the driver of another vehicle was pronounced dead at the hospital.
The highway was closed for several hours.
Click here to follow Daily Voice Bristol and receive free news updates.