The 24-hour strike would impact CityCats which would run every hour at a reduced timetable and would also see some River Ferry services cancelled.
RACQ spokesperson Lucinda Ross said commuters should look for alternative means of transport or plan for travel to take extra time.
“Buses and trains will be unaffected so if you can get to your destination using one of these options, it’s worth a shot,” Ms Ross said.
“Council will be putting on extra bus services to help minimise disruptions, and if you use the ferry services check with Translink’s website to make sure yours isn’t cancelled.
“Be aware your journey may take a lot longer, so make sure you’re factor that in.”
Ms Ross reminded commuters many public transport services would be impacted over the Christmas holidays.
“If you’re working over the holiday period check for service interruptions and always have a backup travel option in mind so you can get home safely and enjoy time with loved ones without delay.”