Toddler dies after wandering unsupervised onto busy freeway

A three-year-old girl has been killed in a tragic accident on a busy Perth highway.

The toddler, who was not with her parents, walked out onto the road and in front of a ute, police said.

The accident was so shocking that people who didn't even know the little girl were in tears at the scene.

"How does a child escape?", one witness wondered. "How does a child get onto a main road?"

It was approximately 6.30am when the toddler wandered onto busy Albany Highway in Gosnells.

It's understood that a driver noticed the little girl on the road, pulled over and tried to coax her to safety when the toddler was hit by a Toyota Hilux ute.

The 30-year-old driver didn't see her.

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A witness desperately tried CPR to save her and the little girl was rushed to Armadale Hospital, where she died.

Witnesses told 7News police were looking for the little girl's parents for almost an hour.

Officers were frantically going door-to-door asking if anyone was missing a three year-old child.

Major Crash Unit detectives are still trying to piece together exactly what happened and want to speak to anyone who saw the little girl or the white ute before the tragic accident.

Anyone with information should call Crime Stoppers on 1800 333 000 or report anonymously online.