Tube

Golden Gate Bridge, 2270s

Golden Gate Bridge, with tubes

Starfleet Headquarters, 2372

Tube going past Starfleet Headquarters

Human spectators, 2394

A crowd of people in front of a tube

A tube was a type of enclosed tunnel-like roadway.

A transport tube was a type of tube used to evacuate the personnel and passengers from one ship to another. (SNW: "Memento Mori")

Trans Bay Tube 2 was a tube used by Trans Francisco in the year 2024. (DS9: "Past Tense, Part I")

At least by the 2250s, tubes were used on the Golden Gate Bridge. During the 50s, they had solar panels, but they were removed by the 2270s. (Star Trek: The Motion Picture, DIS: "Such Sweet Sorrow, Part 2")

Sometime between 2257 and 2342, a large tube was constructed in Paris, which stretched beneath the Eiffel Tower. (TNG: "We'll Always Have Paris") This tube was removed by the year 2372. (DS9: "Paradise Lost")

In 2365, when Lwaxana Troi took the turbolift to the bridge and the bridge crew wondered how she got there, she told them she took the "turbo tube or whatever you call it." (TNG: "Manhunt")

In 2366, tubes were used in the capital city of Angosia III. (TNG: "The Hunted")

In 2372, there was a tube near Starfleet Headquarters that contained a railway for trains. By the year 2381, that tube was used as a walkway for Starfleet officers. (DS9: "Homefront", "Paradise Lost"; LD: "The Stars At Night")

In 2381, there were tubes with railroads for trains on Corazonia. (LD: "In the Cradle of Vexilon")

That same year, there was a variety of elevated tubes on Ferenginar that were used as walkways, to allow a person to walk from one building to another, without having to go outside. (LD: "Parth Ferengi's Heart Place")

In an alternate 2404, several vehicles drove through the tubes on the Golden Gate Bridge as a crowd on the bridge walkway watched Voyager return home from the Delta Quadrant. (VOY: "Endgame")

The tubes shown on the Golden Gate Bridge seemed to be made of glass, transparent aluminum or some other see-through material. Their purpose was never made clear, but they may have been used to protect hovercars or other automobiles from the elements, such as heavy rain or other meteorological disturbances. This likely would have no longer been necessary by the 24th century, since the weather control system was firmly in place. Despite this, tubes were still being used even into the late twenty-fourth century.
The novelization of Star Trek: The Motion Picture mentions that James T. Kirk took a tube from Gibraltar to a Los Angeles air tram station, where he took an air tram to Starfleet Headquarters in San Francisco.
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