The accident happened at about 5:45 a.m. Sunday on the parkway north of Jackson Avenue, where the vehicle went off the road, struck a bridge abutment by an overpass and burst into flames.
Among the dead includes the driver, 19-year-old Bruno Vaccarezza from Cos Cob and his passengers 19-year-old Fernanda Gomez, a Chilean national who lived in Port Chester, 18-year-old Juliana Restrepo from Port Chester and 20-year-old Vincent Mendoza from Norwalk.
"Clearly speed is going to be a factor. There was significant damage. The vehicle went off the road, and struck the abutment head on," said Troop K Commander Major Michael Kopy.
Major Kopy says there is no immediate evidence to suggest drugs or alcohol as a factor in the crash, but more analysis has to be done.
There were not many cars on the road when the accident happened, and investigators are hoping someone saw something, and will step forward with information.
"We have no witnesses at this point, what we have was originally reported as a car fire," adds Major Kopy.
Eyewitness News went to the home of 18-year-old Juliana Restrepo in Port Chester, where family friends say her parents are devastated.
Autopsies on the victims will be performed on Monday.
It is not clear where the car was coming from or headed to. The vehicle they were using was a rental car.
Investigators say the driver had been in a motor vehicle accident, and had rented the Volkswagen from Enterprise in Stamford.