HARRISON, N.Y. (PIX11) – The driver of a tractor-trailer died in a crash in Westchester County on Wednesday, officials said.

The accident happened just before 10:20 a.m. on the westbound New York State Thruway in Harrison, according to a New York State Police spokesperson. The driver of the tractor-trailer lost control on the elevated exit 9A ramp and flipped over a guardrail onto the I-287 westbound lanes, according to officials.

The tractor-trailer driver was pronounced dead, according to police. The driver of a passenger van was also injured in the crash. The driver of the van remained hospitalized in stable condition Wednesday evening, authorities said.

“That was one of the worst accidents I’ve ever seen in my life. The whole tractor-trailer just fell over,” said Kenny Valentine, a tractor-trailer driver.

AIR11 was over the scene around 11:40 a.m. Video from AIR11 showed a catastrophic wreck, with the tractor-trailer lying upside down and horizontal on the roadway.

The crash caused traffic delays for hours on Wednesday, but the lanes that were closed have since reopened.

New York State Police investigators are looking into whether speed played a factor in the crash.

The State Police Bureau of Criminal Investigation is asking anyone who may have witnessed the crash to please contact Investigator Hettinger at (914) 769-2600.