Police investigating the Good Friday smash on the Geelong Bypass say they're still trying to get in touch with two possible witnesses.

A man and woman and their two young kids were hurt when they allegedly got involved in a road rage incident with the occupants of another car.

Detective Acting Sergeant DARRYL OUT tells K-ROCK they've both now been released from hospital:

He adds they’re also looking to speak to two people in hospital scrubs:

The Crime Stoppers number’s 1800-333-000.