AN OUT-OF CONTROL SUV barrelled across several lanes of traffic on a New York highway overpass yesterday, then plunged more than 50 feet off the side of the road and landed in a ravine on the grounds of the Bronx Zoo.

All seven people aboard, including three children, were killed, authorities said.

The 2004 Honda Pilot apparently flipped over a 4-foot-high iron fence before landing upside-down on the property of the nation’s largest city zoo. The cause of the crash was unclear, and police haven’t yet said how fast the SUV was traveling. A city official said the guardrail’s height would be one of the safety issues investigated.

Police identified the dead adults as Jacob Nunez, 85, and Ana Julia Martinez, 81, both from the Dominican Republic, and their daughters, Maria Gonzalez, 45, and Maria Nunez, 39, and three grandchildren. Police say Gonzalez was driving.

The children were identified as Jocelyn Gonzalez, 10, the daughter of the driver, Niely Rosario, 7, and Marly Rosario, 3, both daughters of Nunez.

The SUV was headed south on the Bronx River Parkway when it bounced off the median, crossed three southbound lanes and hit the curb, causing the vehicle to become airborne, continue over the guardrail and plunge 59 feet, police said.

“Obviously, the vehicle was traveling at a high rate of speed,” FDNY deputy Chief Ronald Werner said. “It hit something that caused it to become airborne.”

The SUV landed in a wooded area on the edge of zoo property that’s closed to the public and far from any animal exhibits, zoo spokeswoman Mary Dixon said. The vehicle lay mangled hours later, its right doors ripped off and strewn amid the trees along with items from the car. Next to the heavily wooded area are subway tracks and a train yard.

” I’ve been in the fire department 30 years,” Werner said. “Sometimes you come upon events that are horrific and this is one of them.”

It’s not clear what caused the SUV to go out of control around 12.30pm. The southbound side of the highway was closed briefly Sunday afternoon while police investigated but later reopened.

The medical examiner’s office said it expected to release the victims’ causes of death on Monday.

The accident was the second in the past year where a car fell off the same stretch of the Bronx River Parkway. Last June, the driver of an SUV heading north lost control and the SUV hit a divider, bounced through two lanes of traffic and fell 20 feet over a guardrail, landing on a pickup truck in a parking lot. The two people in the SUV were injured.

City agencies will be asked to look at safety issues on the highway including guardrail height, Bronx borough President Ruben Diaz Jr said in a statement Sunday.

“My prayers, as well as those of my office and all Bronxites, go out to the families of the seven victims,” he said.

The wreck was the deadliest in New York City since the driver of a tour bus returning from a Connecticut casino in March 2011 lost control and slammed into a pole that sheared the bus nearly end to end, killing 14 passengers.