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| Elon Musk says the tunnel system will alleviate road congestion in Los Angeles |
Entrepreneur Elon Musk has unveiled a
prototype underground tunnel in Los Angeles which is designed to
transport cars at high speed around the city.
Modified electric cars would be lowered into the tunnel and travel at speeds up to 150mph (240km/h), Mr Musk says.
The tunnel has been built by Mr Musk's Boring Company, which boasts state-of-the-art engineering techniques.
Mr Musk, best known as the head of Tesla electric cars and the commercial SpaceX programme, arrived at the launch on Tuesday evening in a Tesla car modified to work on the "loop" system.
He was cheered by a small crowd as he emerged from the car at one end of the tunnel bathed in green and blue interior lights.
The plan envisages modified cars being lowered into the tunnel network by lifts and then slotted into tracks on the "loop".