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"I realized there was a heavy-duty change coming in biology, and I could write a really compelling novel about catastrophic evolution, punctuated equilibrium."
- Greg Bear

Single Vehicle Tunnel  
  A small diameter tunnel that accepts a single vehicle to a single destination.  

The taxi lifted straight up. Gaal stared out the curved, transparent window, marvelling at the sensation of airflight within an enclosed structure and clutching instinctively at the back of the driver's seat. The vastness contracted and the people became ants in random distribution. The scene contracted further and began to slide backward.

There was a wall ahead. It began high in the air and extended upward out of sight. It was riddled with holes that were the mouths of tunnels. Gaal's taxi moved toward one, then plunged into it. For a moment, Gaal wondered idly how his driver could pick out one among so many.

There was now only blackness, with nothing but the past-flashing of a colored signal light to relieve the gloom. The air was full of a rushing sound.

Gaal leaned forward against deceleration then and the taxi popped out of the tunnel and descended to ground-level once more.

From Foundation, by Isaac Asimov.
Published by Doubleday in 1951
Additional resources -

Asimov gives you a few more details about this idea. In his 1988 novel Prelude to Foundation, he writes:

What appeared before them now looked like a cliff patterned with cave openings, much like a checkerboard. Hummin maneuvered toward the D-7 opening, avoiding other air-taxis that were heading for other tunnels.
"You could crash easily," said Seldon, clearing his throat.
"So I probably would if everything depended on my senses and reactions, but this taxi is computerized and the computer can overrule me without trouble. The same is true for the other taxis. --Here we go."
They slid into D-7 as if they had been sucked in and the bright light of the open plaza mellowed, turning a warmer yellow hue. Hummin released the controls and sat back. He drew a deep breath and said, "Well, that's one stage successfully carried through. We might have been stopped at the station. In here, we're fairly safe."
The ride was smooth and the walls of the tunnel slipped by rapidly. There was almost no sound, just a steady velvety whirr as the taxi sped along.
"How fast are we going?" asked Seldon.
Hummin cast an eye briefly at the controls. "Three hundred and fifty kilometers an hour."
"Magnetic propulsion?"
"Yes. You have it on Helicon, I imagine."
"Yes. One line. I've never been on it myself, though I always meant to. I don't think it's anything like this." v "I'm sure it isn't. Trantor has many thousands of kilometers of these tunnels honeycombing the land subsurface and a number that snake under the shallower extensions of the ocean. It's the chief method of long-distance travel."

Compare to the pneumatic tube station from Exiles of the Moon (1931) by Schachner and Zagat, the submarine tube from An Express of the Future (1895) by Jules Verne, the sub-Atlantic tube from Ralph 124c 41 + (1911) by Hugo Gernsback, the vacutubes from Double Star (1956) by Robert Heinlein and the public tubes from The Houses of Iszm (1954) by Jack Vance.

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Additional resources:
  More Ideas and Technology from Foundation
  More Ideas and Technology by Isaac Asimov
  Tech news articles related to Foundation
  Tech news articles related to works by Isaac Asimov

Single Vehicle Tunnel-related news articles:
  - First Boring Passenger Station In Las Vegas
  - Asimov and Musk - Boring Company Tunnel vs. Street Race
  - Las Vegas Tunnels To Have Autonomous Teslas

Articles related to Transportation
CopterPack Is Robert Heinlein's 1954 Copter Harness
Las Vegas Tunnels To Have Autonomous Teslas
First Boring Passenger Station In Las Vegas
Tesla's 20,000 Superchargers

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