An Australian man has died in hospital after he was hit by three vehicles while walking on the Monash Freeway.

The 27-year-old man's grey Peugeot 206 sedan was travelling into Melbourne about 4.40am when it hit a barrier at a construction zone, police said.

The sedan drove up an embankment, clipped a light pole and crossed the Police Road on-ramp before colliding into the barrier.

The driver, who was the car's only occupant, walked onto the freeway where he was hit by a four-wheel-drive which stopped at the scene.

Shortly afterwards he was struck again by an oncoming sedan and then a truck. These vehicles did not stop.

The man was taken to the Royal Melbourne hospital with life-threatening injuries and died several hours later.
SMH