Doctors say the lives of two Australian Institute of Sport cyclists remain in the balance as families of those injured in Monday's fatal accident arrived in Germany.

Alexis Rhodes and Louise Yaxley are in a critical condition after a runaway car mowed down six of the AIS women's road team in training south of Leipzig, killing Amy Gillett.

"These two girls have very complex injuries," deputy chair of Jena University Clinic intensive care unit Gernot Marx said.

"There can be complications in due course. It still can develop into a life-threatening situation. That is the nature of intensive care."

Rhodes has severe injuries to her chest and spine and extensive tissue damage.

Asked if Rhodes may be paralysed as a result of the accident, Dr Marx said "it may cause neurological symptoms".

Yaxley has a severe head injury, chest and abdominal trauma, a stab wound to the abdomen most likely caused by a tree branch, a broken arm and severe arm and leg damage that will eventually require plastic surgery.

Rhodes momentarily was conscious after the crash, but neither of the pair have regained consciousness in Jena, and are expected to remain in the clinic for at least a month.

Dr Raik Schafer, who was the first doctor at the scene of the crash, said some of the riders were thrown as far as 30 metres by the collision.

He said Gillett, who was the lead rider when the out-of-control car hit them, was likely killed on impact.

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