Motorists have warned of the deadly risks of stepping foot on high-speed roadways after two women lost their lives trying to help an injured kangaroo.

The women were struck and killed on the Hume Highway at Craigieburn in Melbourne's outer north on Thursday night.

Road policing assistant commissioner Glenn Weir said the pair were driving towards the city when they hit a kangaroo and stopped to assist it.

Police believe another vehicle travelling in the same direction did not see their car until the "last minute" and swerved to avoid it, hitting the women at high speed.

A 30-year-old Beveridge woman died at the scene, while a 30-year-old Thomastown woman was flown to hospital and later died.

The driver stayed at the scene and assisted police.

Mr Weir said the section of the freeway wa

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