First responders in Detroit are describing a car crash as one of the worst they've ever seen.
The accident, which occurred around 1 a.m. Oct. 13, killed four people, reports WXYZ.
"Just the amount of carnage I guess involved in this crash, it kind of set a lot of people back," said Michigan State Police Lt. Mike Shaw.
Police said a Buick SUV carrying five people was found mangled and crushed on the right embankment of the highway.
The front seat passengers, each of whom was found dead inside the car, were identified by Shaw as Doreal Rogers and Alesia Maddox, both 20 years old.
They were not wearing seatbelts, but they were not thrown from the car because they were pinned inside by the impact of the crash, Shaw said.
The two 18-year-old backseat passengers, siblings Armonie Maddox and Ervin Johnson, were also not wearing seatbelts, but they were ejected from the car and both died at the scene.
The only survivor is Alesia's son, who turned 1 just two days before the tragedy. He was the only person wearing a seatbelt.
However, the child was improperly buckled into a car seat. "It wasn't the right age, it wasn't the right fit, it wasn't the right anything and still saved this kid's life," Shaw explained.
Eyewitness John Wade was driving down I-94 when the crash happened.
"Out of nowhere the car came flying down the side of us, doing about 80," he said, explaining that the doomed SUV swerved across three lanes then hit an overpass bridge.
"It hit the wall, hit the wall hard and it just spun out of control," explained Wade.
He said his father helped rescue the 1-year-old from the car. "The baby was in a car seat. That's the only thing that probably saved the baby was the car seat."
All four victims are residents of Detroit, investigators say. Speed is suspected to be a factor in the crash, but the exact cause is as yet undetermined.
The infant was examined for minor injuries at a hospital, and will be sent home with relatives.
For Americans under age 54, motor vehicle crashes are a leading cause of death, according to the Centers for Disease Control and Prevention (CDC).
Despite the fact that seat belt use is one of the most effective ways to save lives and reduce injuries in crashes, millions do not buckle up on every trip, the CDC notes.
In 2015, the most recent date for which data is available, a total of 22,441 people died in motor vehicle traffic crashes. More than half of teens and adults aged 20-44 years who died in those crashes were not wearing a seatbelt.