The newest extension to the WestConnex motorway tunnels opened today, two months ahead of schedule. Officially opened by NSW Premier Dominic Perrottet on 19 January 2023, the M4-M8 Link Tunnels, also known as WestConnex Stage 3A, comprises 7.5km long twin road tunnels, mostly 3 lanes each way, with underground connections to the existing WestConnex Stage 1 (M4 Motorway Tunnels) and WestConnex Stage 2 (M8 Motorway), and the future WestConnex Stage 3B (Rozelle Interchange).