COVINA — Three teenagers suffered major injuries Friday in a solo-car crash on a residential street, authorities said.

The injured teens — a 17-year-old girl, a 17-year-old boy and a 14-year-old girl were taken to Los Angeles County-USC Medical Center with “substantial injuries,” however their conditions were no immediately clear, Los Angeles County Fire Department Battalion Chief Jim Enriquez said.

The crash took place about 3 p.m. on Edna Place, just east of Armel Drive, near an S-turn neighbors said has seen more than its fair share of crashes.

The Ford Taurus was eastbound on Edna Place and had just passed through the S-turn at an unknown speed when the car veered toward the right side of the road and struck a tree, Covina police Sgt. Jim McDonough said.

The cause of the crash remained under investigation, and the relationship among the three injured teenagers was not available.

Firefighters used the “Jaws of Life” to cut the badly damaged vehicle apart and free the three young people inside.

The two injured girls were flown to the hospital by helicopter, Enriquez said, while the injured boy was hospitalized via ambulance.

Neighbors said for years, and even decades, they’ve sought to have something done about speeding cars on the street, and the crashes that ensue.

“We need a stop sign,” said neighborhood resident L.W. Bellwood, gesturing toward the intersection of Edna Place and Armel Drive.

In his 39-year living in the neighborhood, he said he’s seen at least a dozen crashed at the same spot. He pointed out nearby trees and lamp posts that had been struck be vehicles in the past.

“If they had a stop sign there, at Armel, that would do it,” he said.

Another neighbor, Julio Escobedo, agreed, and also suggested adding speed bumps to the roadway near the S-turn.

The crash is being investigated by the Covina Police Department.