Transport for NSW has released further details about the proposed Riverwood car park announced last week.
A site has been found for extra commuter car spaces at Riverwood station.
A four-level multi-storey car park providing up to 140 parking spaces at Riverwood will be built at a site off Webb Street, next to the existing car park near Riverwood Station, with funding provided by the state and federal government.
The project will see 90 new Opal Park and Ride spaces and convert the existing 50 spaces to Opal Park and Ride, a Transport for NSW spokesperson said.
"Our commitment was to provide up to 150 additional spaces at Riverwood. Delivering local infrastructure like the Riverwood Commuter Car Park is complex and requires the Government, Council and the local community to work together to get the best outcome," the spokesperson said.
"When we started to progress the design of the car park, we realised that going any higher than a four-level multi-storey car park would have too much of an impact on the neighbouring properties.
"We will deliver 90 new Opal Park and Ride spaces and convert the existing 50 spaces, which are currently three-hour timed spaces, to all day Opal Park and Ride spaces.
"Transport for NSW will monitor the uptake of the car park once it is opened, and if we need to go back and do more, we will, of course, look at that," the spokesperson said.
The proposal's key features include accessible parking spaces and lift access, and CCTV, lighting and wayfinding signage for safety and security.
There will be provision for future electric vehicle charging spaces, Transport Park and Ride infrastructure (Opal operated boom gates) and rooftop solar panels.
Community consultation for the project will begin later this year when residents will be able to view and comment on the Review of Environmental Factors, the official planning document for the proposal.
Construction is expected to take 18 months from when a contractor is appointed.