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Giant hole opens up in street with no gate around it. Have they actually spent time thinking about this or is this a joke?

there is cool new technology called a "barrier" that could be used

Indeed. They might want to have included that in the video if they were suggesting this as an actual project and not a toy vision.

This is a mock up. Do you seriously think they forgot to ask the question "what about the giant hole in the ground"? lol

then the vehicle on a tray is accelerated up to high speed inside a tunnel without its axles or body being secured onto the carrier.

Then a vast network of these tunnels is somehow posited.

I don't think reality was one of the constraints applied to this concept.

> without its axles

electric hub motors would work here quite easily.

hub motors?.. no, my point was: what is stopping the car from flying off the carrier?