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Vehicles are mostly designed for whatever environment they're in, which often limits them to one section.
Zero-G environments usually involve some controllable rocket propulsion. Moving machinery is a danger to people (even if most people are kept clear of Zero-G areas), so is kept to a minimum.
Most sections feature a rail-based transport system, because a malfunction might cause a failure in the "gravity"-system and you don't want large vehicles free-floating all over the place. Free-roaming vehicles tend to be small (one or two people) to minimise the danger, and most are anchored when they're parked (anchoring spots are liberally distributed around the section).
Inter-section transport usually requires a transfer to the backbone network (again, a rail-based system).
However, a secondary transport network exists between the hull docking-bays using the ships.So sometimes it's simpler, and faster, to fly along the hull, rather than to take multiple transfers within the interior structure.
Crime exists in various banned drugs, and technology. Often there's a brief spike in criminality when arriving at a planet. Dangerous goods are smuggled up from the planet, unauthorised people escape down to the planet (either against the planet's wishes, or to escape the Ark's own Law-system). A number of cultures harbour illicit practises (eating the other species is a common issue with newcomers). Some "normal" technologies can become addictive to other species (the law usually restricts the technology rather than bans it). General violence does occur, cults, illegal hull-racing, data theft, identity impersonation, AI subversion, various other nonsense.