This is the appalling moment an LA freeway descended into absolute chaos after a motorbiker kicked a car during a moment of apparent road rage.

The video, recorded at around 6am Wednesday on the southbound 14 Freeway, shows a horrifying chain reaction that sees cars veering across the road and one vehicle on its roof.

Police are now investigating the incident as a hit and run - and hunting the biker, who they say left one of the drivers hospitalized, KTLA 5 reported.

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Shocking footage was taken of a biker kicking a silver sedan (left) at 65mph on LA's 14 Freeway Wednesday. The sedan then appeared to lose control and hit the concrete divider (right)

The passenger who recorded the video - and did not wish to be identified - said the vehicles were moving at around 65mph when the crash occurred.

He told NBC Los Angeles he started filming after he saw a sedan in the carpool lane inadvertently cut off the motorbike, leading to an exchange of words.

The biker then swung around to the driver-side door of the car and gave it a hefty kick, which is where the video begins.

The sedan swerve left, smashing into the concrete divider in the center of the freeway before veering to the right and across two lanes of traffic.

It's unclear whether the driver lost control before the swerve, or whether they intended to strike the biker with their car.

The sedan then clips the rear of a white pickup, causing it to flip on its side and then onto its roof.

The sedan then spun across three lanes and struck a white pickup that was flipped onto its roof (right) while the biker (far left) sped on. Cops are treating it as a hit-and-run

The biker races off as the silver sedan stops in the right-hand lane, steam billowing from its crumpled hood and the white truck spins to a standstill.

Footage caught by NBC Los Angeles' chopper after the crash shows the white pickup's doors cut off and its elderly driver being carried out on a stretcher.

The man was hospitalized, said California Highway Patrol, who declined to give any further details about the victim.

'Obviously it was a road rage incident. He was kicking the vehicle. We have to get a statement, see what's going on,' CHP officer Josh Greengard told NBC.

The man who shot the footage turned it in to police.

'The old man who had nothing to do with it was the one that got hurt,' he said. 'Hopefully by doing this, it can help him out.'