Two men have been hospitalised following a high-speed crash on a suburban street near Liverpool in Sydney's south-west.

The collision was captured on camera from multiple angles as a ute shot down Fourteenth Avenue in Austral.

At the same time, a Corolla appeared to roll through a giveway sign before the high-speed smash.

The fiancée of the 21-year-old driver of the Corolla was one of the first people on scene and described it as "horrific" and 'traumatising".

"My fiancé was on his way back here. We were in the living room waiting. We all rushed outside, found that it was him that was involved," she said.

The ute tumbled down the street before hitting a palm tree 50 metres away.

Neighbours ran to help.

"We were shocked. We thought he died, we ran, all of us, we ran there to try to

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