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The world is at a technology level where it is capable or interplanetary travel.

What changes can be made either to the planet or to the physics that could prevent them from ever creating cars planes or tanks.

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    $\begingroup$ Human flight would eliminate many of those needs. Hard to say what would stop tanks $\endgroup$ – Trevor Aug 2 '18 at 15:25
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    $\begingroup$ You ask "what changes can be made" without ever explaining the world you're talking about. Do you aim at an Earth-like civilisation? Or like Avatar with floating rocks and exotic materials? Was this world ever visited by other space travelers? Please edit your question to clarify the circumstances. $\endgroup$ – Elmy Aug 2 '18 at 15:30
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    $\begingroup$ If you change it from "never created" to "no longer used", then a scifi world with only trains and boats might be reasonable. $\endgroup$ – Giter Aug 2 '18 at 15:30
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    $\begingroup$ Steam and Hydrogen power are perfectly viable for cars. $\endgroup$ – Trevor Aug 2 '18 at 18:41
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    $\begingroup$ P.Lord, you mean devoid of all chemical energy substances (such as coal and steam). Fossil fuel is just one solution. You can't jump over obvious technological dependencies. How did this civ create nuclear power without first burning wood? wood = steam = trains, planes, trucks, and cars. Did they never have bicycles? Did no one ever wish for a motor on their bicycle? Your premise is impossible. $\endgroup$ – JBH Aug 2 '18 at 18:59
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I think you're asking the wrong question. If they are that advanced, then it's possible they abandoned the use of these kinds of vehicles, for the most part.

Otherwise we have very little info. Perhaps these people have telekinesis that's easy to use, so they never had to develop wheeled transports of any kind. Perhaps since they invented teleportation for quick travel and they eliminated pollution-causing vehicles, there aren't many land vehicles.

Perhaps it's a waterworld? Just tiny bits of land, so it's not over useful to have vehicles. Mostly people walked everywhere, or swam, or used boat transport. Why build a bridge if you've always used boats throughout your history? Maybe when they got really advanced someone built an elevated train. (you never said a train was off the table....) No planes because no runway space?

Seems a little insane to change fundamental aspects of a planet's physics just to achieve this, when a little shift in geography, and mainly culture would do.

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  • $\begingroup$ You can change geography. It is one of the only things I said. $\endgroup$ – P.Lord Aug 2 '18 at 18:17
  • $\begingroup$ @P.Lord Yes that's why I did not include change in psychics. Oh but they would totally have balloons early on. $\endgroup$ – Erin Thursby Aug 3 '18 at 0:30

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