The new rail timetable could create an urgent need for better parking at Thirroul train station, neighbourhood forum convener Stephen Kennard says.
Mr Kennard had been discussing the need for a multi-storey car park with Wollongong City Council and Roads and Maritime Services for close to two years.
"Traffic in Thirroul is just a real problem," Mr Kennard said.
"Thirroul is a major railway stop. It always has been and probably always will be. All trains stop at Thirroul from Sydney, no matter how fast they are.
"It means people will come to park at Thirroul to get a train to Sydney. That's happening more and more because there's a new estate on the eastern side of the line at Thirroul."
At present there are two commuter car parks, a completely asphalted one on the eastern side of the train station, and another that is partially dirt and grass immediately north of the Railway Parade and Lawrence Hargrave Drive intersection.
Mr Kennard said both those car parks filled up early on weekdays. With the new timetable featuring a number of evening trains that stopped at only Helensburgh or Thirroul, Mr Kennard said he expected Thirroul to become a lot busier.
"If they do that it'll make it a lot worse for Thirroul because a lot more people will want to park there, "he said
"I live at Austinmer, and if I'm going to have to catch a train from Thirroul I'm much more likely to drive and leave a car there than if I had to catch it at Austinmer because I could walk there.
"That's something that's going to happen to lots of people. It will tend to bring on a parking problem earlier rather than later."
Transport Minister Gladys Berejiklian said the region had already received a lot of money for station upgrades.
"Under the Transport Access Program the Illawarra has been a huge beneficiary of funding under this government - with easy access upgrades right across the region and surrounding areas including at Albion Park, Austinmer, Dapto, Gerringong and Waterfall; interchange upgrades at Oak Flats and Picton; new commuter car parks at Kiama, Moss Vale and Oak Flats; and of course the new Shell Cove Station," Ms Berejiklian said.
She said that Transport for NSW undertakes ongoing planning to identify which projects will come next, based on a range of criteria.
She added that the parking situation at Thirroul and any possible changes "will be considered as part of the program".