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I remember a TNG episode where some scientists said that warp drives were causing a lot of damage to subspace. At the end of the episode Star Fleet decided that warp speeds would be restricted to warp 5 except for emergency situations.

Of course the next episode they were cruising along at warp 7.

Is this ever mentioned again in Star Trek?

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I heard that the Voyager was designed in such a way that it worked around this problem. I think there is an article on memory alpha about it. Great question BTW. –  Mark Rogers Mar 17 '11 at 22:43
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The episode was Force of Nature Season 7 Episode 9. This article on Warp Field has a brief paragraph on the subject, both on Memory Alpha. –  Mark Rogers Mar 17 '11 at 23:01
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@Mark, I remember hearing the same thing, the whole deal with VOY's nacelle's swinging in and out was meant to lessen the impact. –  Teknophilia Mar 17 '11 at 23:26
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Since when has a negative effect on the environment ever stopped anyone from driving faster? ;-) –  Thomas Jun 26 '11 at 18:02
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I had always thought that the restriction was being placed upon regions of space that are more susceptible to damage, but I just re-watched the final scene in that episode and it certainly does appear to be a "global" speed limit. Huh. –  Mike Boers May 5 '12 at 1:11
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It was never addressed in canon.

The episode to which you refer, "Force of Nature", occurred in the last season of The Next Generation at a time when most of the effort in storylines was geared towards Star Trek: Voyager and Deep Space Nine: the developers of those shows didn't particularly focus too much on the continuity issues introduced as The Next Generation was wrapping up. Indeed, even The Next Generation writers ignored or found ways around it for the remainder of the season.

However, according to Memory Alpha:

According to the unpublished VOY Season 1 edition of the Star Trek: Voyager Technical Guide, by Rick Sternbach and Michael Okuda, it was suggested that because of the variable geometry pylons, warp fields may no longer have a negative impact on habitable worlds as established in this episode.

But since the manual was never published, it's not canon. Alternative theories include:

  • In Deep Space Nine, the Dominion War was more important than an environmental concern.
  • In Star Trek: Voyager, they were so far away from the Federation and getting home was such a huge priority, any non-core regulation artificially limiting their ability to travel was summarily dismissed.

It's also interesting to note that the issues raised in "Force of Nature" are referenced, indirectly, in the last season Voyager episode, "Renaissance Man", when the Hierarchy attempt to trick the Voyager crew into ejecting their warp core because they entered an area that's occupied by people who believe warp drives disrupt subspace.

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It's also worth noting that TNG struggled over its run trying to move from an episodic series (which was Roddenberry's intention with TOS and TNG) into an ongoing continuity. –  HorusKol Jun 27 '13 at 0:40
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Early in the episode The Pegasus Picard is given orders to search for the titular ship. The admiral who gives him the order also gives him authorization to ignore the warp speed restriction, for the course of the mission. This episode was 3 episodes after Force of Nature, the episode where the 'speed limit' is introduced.

It was never mentioned during DS9. During VOY, they may have mentioned it during a couple of episodes where there are regions of space that are unsafe to traverse via Warp Drive (here and here), but I don't recall offhand.

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Good catch, I remember it being mentioned but had little hope of finding which episode! –  sanity Mar 18 '11 at 4:56
    
I wonder, however, if warp above 5 is mentioned subsequent to Force of Nature without it being an emergency? –  sanity Mar 18 '11 at 4:57
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I think they mentioned the limit (as in, "we're ignoring it on purpose") for the following 2 or 3 episodes, then dropped it. –  benzado Mar 18 '11 at 7:09
    
@sanity not sure what the emergency was, and unfortunately I don't have access to TNG season 7 to find out. –  Keen Mar 18 '11 at 9:52
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It's also mentioned in passing in the episode Pegasus, when Picard is given authorization to exceed warp speed limitations "for the duration of this assignment". –  neilfein Aug 4 '11 at 5:15
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