The New M4 Tunnels opened to traffic in July 2019. WestConnex M4 (the New M4 Tunnels and the Widened M4), includes 5.5km Tunnels and around 8.5km of surface roads
WestConnex in tunnel air quality monitoring program and ventilation systems have been designed to protect and improve the health of local communities and motorists using the tunnels
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English (United States)
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M4 Tunnels air quality