Technology entrepreneur Elon Musk has hinted interest in helping solve Sydney’s road congestion nightmares, quoting $1 billion on Twitter for a high-speed transit tunnel through the Blue Mountains.
People would not actually drive through the tunnel - their vehicles would be secured on platforms that can travel at high speeds between platforms.
The 50 kilometre tunnel would link the Penrith and Lithgow regions, opening up the Western parts of the state.