Cristiano da Matta is to be moved out of intensive care within the next two days as his condition continues to improve following his testing accident two weeks ago.
The Brazilian is still unconsious, but is now off the ventilator that has been providing reparatory support to him since his accident. He will move to another medical unit soon.
Champ Car medical director Dr Chris Pinderski flew back to Wisconsin to monitor the condition of da Matta.
"Cristiano still continues to show daily improvement while in the intensive care unit at Theda Clark Medical Centre," said Pinderski.
"He is becoming more alert each day. It is anticipated that he will be transferred from intensive care to a step-down unit in the next 24-48 hours where his recovery will continue."
Da Matta's RuSPORT team have received many messages of goodwill since the accident.
"We were overwhelmed by the concern and support for Cristiano," said RuSPORT president Jeremy Dale.
"RuSPORT would like to thank all of the fans for the support they have given to Cristiano and his family though this difficult time. It's very comforting to the team and to the da Matta family to know that the fans care so much about Cristiano."