But the bus company denies the medical event the driver suffered behind the wheel of a public bus the next day - resulting in him being rushed to hospital - was related to the earlier crash.
Go Bus operations director Nigel Piper said it was an ''unfortunate coincidence'' it was the same driver who operated the bus which forced pedestrian Tawera Montgomery (16) into a ditch in Karitane on Thursday and then the next day suffered a ''medical event'' when driving another public Go Bus in Karitane.
''At this time there is no evidence the two incidents were related,'' Mr Piper said.
A St John spokesman said a 61-year-old man suffered a minor ''medical incident'' and was taken by ambulance from Coast Rd to Dunedin Hospital's emergency department before noon on Friday.
It is understood passengers were on board when the driver suffered the medical event.
Mr Piper said the incident on Thursday appeared to be the result of ''a momentary lapse in concentration'' by the driver.
''The driver was declared fit to return to work on the basis of medical advice and drug and alcohol testing. However, this decision was reviewed by senior staff during the morning and it was accepted there was an error in judgement allowing the driver to return to work so quickly.''
Consequently, a decision was made to stand the driver down.
''Concurrent to this the driver suffered a minor medical event, but at no time was the safety of passengers compromised.''
Go Bus took its responsibilities to its drivers and passengers ''very seriously'', Mr Piper said.
''We are continuing to investigate both incidents and supporting our driver following what has been a difficult few days.''
Otago Regional Council support services manager Gerard Collings said the council, which holds the contract for the public transport bus service, did not have any concerns about the driver returning to work the next day.
''As the operator adjudged, he was fit and able to do so.''
The new contract for the service has been let to Ritchies and takes effect from September 18, Mr Collings said.
