The first of the many accidents involving the rail network occurred in October 2016, when a train derailed near Wollongong.
As a result of the crash, the Wollangong Expressway was closed for a couple of weeks, with a new section connecting the city to the rest of New South Wales.
The NSW Government has announced it will not reopen the highway until 2019.
“We understand that this is a difficult decision, but we need to make it as simple as possible for everyone, including drivers, to use our network safely,” a spokesman for the State Government said.
The NSW Police Service has also been informed of the closure, and has begun reviewing the safety of the rail infrastructure, with the first section of the freeway due to open in 2019.
“The State Government will continue to work closely with the NSW Police Force and Transport for NSW to ensure the safety and security of NSW’s rail infrastructure,” a spokesperson said.
“At this time, there is no timeframe for the opening of the new section of road.”