'Dooring' fines of up to $366 apply to all car users - not just the driver. Drivers and passengers face a $122 fine from police for creating a hazard, with courts able to impose a maximum fine of $366.

Last week VicRoads raised the issue of car passengers opening doors on cyclists on its Road User or Abuser Facebook page, part of a social media campaign to promote discussion about road use safety.

Bicycle Network Victoria spokesman Garry Brennan said it was rarer for passengers to open doors on cyclists but because it was more unexpected than driver doorings, it could be more deadly.

"No one does this deliberately, but they should be expecting bike riders in the street and act accordingly," Mr Brennan said.