Senior Constable Harry Thomas Little, 40, has been charged with dangerous driving occasioning grievous bodily harm after an on-duty collision, injuring Gai Vieira, in Cronulla about midday on September 5.

Little was allegedly driving at a dangerous speed when his NSW Police Ford Falcon XR6 hit Ms Vieira's Mercedes at the Kingsway and Connels Road intersection, according to court documents.

Ms Vieira, then 68, was taken to St George Hospital in a critical condition.

Police say a young boy, who was a passenger in the Mercedes, escaped injury.

Outside Sydney's Downing Centre Local Court on Monday, racing horse owner Bert Vieira said his wife remained in hospital in a coma and had shown "very slight signs" of improvement.

"All I can say is one day folds into the next," Mr Vieira told reporters.

"We grab at anything - a blink of an eye, a swallow, we grab at anything we can.

"They (the doctors) say it will take a long time, a miracle."

Mr Vieira vowed to continue his campaign to see high-speed police chases banned or restricted across NSW, and traffic lights installed near the site of the collision.

He was angered Little did not appear in court, however the officer was not legally required to do so.

Little has been excused from appearing when the matter is next heard on February 5, 2019.

NSW Police in September said his duty status "is under review".

Outside court, Little's solicitor Warwick Anderson said the policeman was doing "as well as can be expected", adding "it's a very difficult time for him and his family".

Australian Associated Press