[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/wedontneedroads_6899.jpg]]
->''"Roads? Where we're going we don't need... roads."''
-->-- '''Doc Brown''', ''Film/BackToTheFuture''

Cars in fiction tend to be [[CoolCar pretty awesome]]. Some just look cool and go fast. Others have [[WeaponizedCar weapons systems]] and [[InvisibilityCloak active camouflage]] built into them. And then there are these cars, which can transform in order to traverse terrain meant for other vehicles. Like boats. Or ''planes''. There are practical reasons for this to be the case, of course; after all, you wouldn't want to have to give up chasing the villains because they planned a water escape that you didn't account for. The primary reason, though, is the RuleOfCool. Because being able to drive off a pier in a sports car, transform on the way down, and hit the water in a speedboat is just plain badass.

Less drastic modifications can be expected as well for different terrain on land, like retractable tire studs for driving on ice and other slick surfaces. Any weapon systems the car is equipped with will sometimes inexplicably change in order to fit the new environment; rather than missiles, the car will have torpedos.

The GadgeteerGenius is almost certainly the one who made all these awesome modifications. A subtrope of CoolCar and a SuperTrope for FlyingCar, HubcapHovercraft and AmphibiousAutomobile. Often overlaps with CoolBoat and CoolPlane, for obvious reasons.
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!!Examples:

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[[folder: Anime and Manga ]]

* ''Anime/SpeedRacer'''s car can become a sub.

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[[folder: Film ]]

* At the end of ''Film/BackToTheFuture'', Doc Brown travels forward to 2015 and gets some pretty major work done on the Delorean, including a "hover conversion" that's really more of a "flight conversion". At the end of ''Film/BackToTheFuturePartIII'', he does the same thing to a ''[[CoolTrain locomotive]]''.
** The fact that the Delorean is a time machine in the first place qualifies it for this trope.
* ''Film/ChittyChittyBangBang'' might actually be the UrExample of this trope. The major premise was basically "Check out this car: it can fly."
* Many ''Film/JamesBond'' examples.
** In ''Film/{{Moonraker}}''. Bond's gondola transforms into a hovercraft, allowing him to drive it onto the streets of Venice.
** Scaramanga in ''Film/TheManWithTheGoldenGun'' has a car that can fly (with an attachable wing and engine).
** ''Film/DieAnotherDay'''s Colonel Moon uses hovercrafts to cruise over the Korean demilitarized zone (which is littered with mines). Bond destroys his base, and Moon is forced to go underground and build a giant sunlight-reflecting satellite to destroy the minefield, instead. (Which had to be more expensive than simply buying more hovercrafts...)
* ''Film/TheLastStarfighter''. Centauri's car is also a starship.
* In ''Film/BluesBrothers2000'', the updated Bluesmobile could function underwater.
* Quorra's car in ''Film/TronLegacy'' can operate in the rough terrain off The Grid, unlike most ground vehicles in [[BigBad Clu's]] arsenal.
* ''Film/RaceForTheYankeeZephyr''. Barney and Gilbert need money to repair their helicopter in order to salvage the Yankee Zepher. Gilbert's daughter Sally points out that the map shows plenty of roads, so they can just drive. Barney rejects these as "paper roads, government ink". The helicopter later crashes, but some friends of Gilbert modify the helicopter cabin into a caterpillar-tracked all-terrain vehicle.
* In the Russian Super-hero film Black Lightning the protagonist discovers that the used car his father bought for him as a birthday gift can fly after accidentally triggering its flight capabilities while trapped in traffic. He soon learns With Great Power Comes Great Responsibility and becomes Moscow's first super-hero.

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[[folder: Literature ]]

* The Creator/RobertAHeinlein novel ''Literature/ThePuppetMasters'' has "triphibians": cars that can drive on land, fly through the air and travel on water.
* Possible example (depending on how loosely you define "car"): The ''Terror'' in Creator/JulesVerne's ''Master of the World'' functions as an aircraft, boat, submarine and automobile.

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[[folder: Tabletop Games ]]

* ''[[TabletopGame/{{Traveller}} MegaTraveller]]'' ''Referee's Companion''. At Tech Level 8 vehicle transportation includes triphibians, which can travel on land, in the water and through the air.
* ''TabletopGame/{{Champions}}''. Vehicles can have any form of movement super characters can, including flight, swimming, tunneling and even teleportation. They can also have the power of ShapeShifting so they have an appropriate form for the movement mode they're in.
* Game Research Group's ''Helltank Destroyer'' had Triphibious Cruisers, which could travel on land, in (and under) water and through the air.
* ''TabletopGame/CarWars'' has "Grasshoppers", lightweight car/helicopter hybrids. Their armour tends to be rather poor, but if someone is chasing you too closely? Well, many of them come with bombs, you see...

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[[folder: Video Games ]]

* The ''VideoGame/SpyHunter'' games are probably one of the best examples of this. In addition to being able to transform into a CoolBoat, if the armor takes too much damage, it will be shed to reveal a motorcycle (or a jetski) underneath). In the sequel, it can optionally convert into an off-road mode, where the ground clearance is raised, wheels widened and the tyres have spikes come out of then, which reduces speed but significantly improves handling when offroad.
* One of the more expensive mods you can add to your car in ''VideoGame/StreetsOfSimCity'' is a flight modification which, well, [[CaptainObvious allows you to fly]]. Why is this useful, you ask? Dude, you can make your car [[Franchise/BattlestarGalactica frakking]] fly. Who needs a reason?
* Certain Cybran Nation warships in ''VideoGame/SupremeCommander'' can deploy ''legs'' and turn into a [[SpiderTank Spider Ship]], walking out of the sea and onto land to support their ground forces when assaulting a shoreline.
* In ''VideoGame/SonicAndSegaAllStarsRacing Transformed'', vehicles convert between car, aircraft and boat depending on the terrain.
* ''Videogame/{{Vigilante 8}}'' and the second game feature {{Power Up}}s that change the wheels of the vehicles into propellers (for driving on the waters) and, in the Alaska stage, skis for front wheels and bulkier wheels for the back ones.
* ''Videogame/CrashNitroKart'': [[BigBad Emperor Velo]] tells the kidnapped racers (either Team Bandicoot or Team Evil) that he has their vehicles modified so they can race in the tracks he has set on 4 planets. The modification seems to be the wheels, which can now turn 90 degrees and emit anti-gravity/magnetic waves so they can ride on the heavily-tilted tracks or giant tube tracks.
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[[folder:Web Comics]]
* The new Spark built Corbettite train from ''Webcomic/GirlGenius'' does not really need tracks and can make its own tunnels through rocks in order to meet up with existing underground lines. The Beast also did not require tracks, but since it was a murderous machine that wanted to eat everything instead of give passengers a ride this was less than optimal.
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[[folder: Western Animation ]]

* The ''WesternAnimation/{{Teenage Mutant Ninja Turtles|1987}}''' van could become a hovercraft of some sort.
* In ''[[WesternAnimation/DuckTales Double-O-duck]]'', Launchpad [=McQuack=] is given a car that can turn into a boat or an helicopter.
* WesternAnimation/DangerMouse has a car that can also become an airplane. In fact, it's seen up in the air more often than not.
* The ''Franchise/WallaceAndGromit'' short "WesternAnimation/ACloseShave" features a motorcycle sidecar that doubles as a plane.
* ''{{WesternAnimation/Superfriends}}'' (1973/74) episode "Too Hot To Handle". The aliens have a fire truck that can convert into a rocket ship and fly.
* ''WesternAnimation/BatmanTheBraveAndTheBold'': Both the Batmobile and ComicBook/GreenArrow's Arrowcar can transform into planes. The Batmobile can also turn into a GiantMecha.
* The Ghostbuggy from ''WesternAnimation/FilmationsGhostbusters''. The series took this UpToEleven: to see the car actually ''driving'' was a rare sight ([[LimitedAnimation the wheels didn't have to be animated]].)
* The Gadgetmobile in ''WesternAnimation/GadgetAndTheGadgetinis'' and ''WesternAnimation/InspectorGadget2015''. The earliest model had a plane mode in "Inspector Gadget Saves Christmas," but only to set up a "Go-Go Gadget Plane" joke.
* ''WesternAnimation/{{MASK}}'' featured several cars that could turn into planes, and motorcycles that could turn into flying vehicles as well. Some of the other cars could deploy different types of craft (usually either a boat or a plane), leaving behind the main vehicle as a shell, and still others could convert from street cars into tank-like battle vehicles.
* In ''WesternAnimation/TheTransformers'', several of the Autobots were modified so that they could retract their wheels and replace them with hydrofoils for long-distance water travel. In addition, Brawn could turn the front end of his car into a [[DrillTank large drill bit]] for tunneling. These options were never included on the [[MerchandiseDriven original toys]], although Tracks' ability to become a flying Corvette ''was'' part of his toy. (The mail-order, toy-only Omnibots Downshift and Overdrive could also become flying cars.)
** While most of the Triple Changers had vehicle modes that were completely different from each other, Springer was unique in that his helicopter mode was basically the same as his car mode, just with the rear end folded out to the rear to form a tail, and the front bumpers shifted and extended to form wings. Springer was also the only one of the original Triple Changers who retained his Cybertronian vehicle modes.
** Speaking of Triple Changers, Astrotrain didn't strictly need tracks to ferry his fellow Decepticons about in his locomotive mode, and he could even transform into shuttle mode while in transit without disrupting his passengers... somehow (considering he had to turn upside-down to complete the transformation).
* On ''WesternAnimation/WackyRaces'', the Mean Machine, Crimson Haybaler, Convert-A-Car and Creepy Coupe can go airborne where necessary. Dick Dastardly's Mean Machine was especially versatile--in "Real Gone Ape" it's used as a submarine.
* WesternAnimation/CoolMcCool's Coolmobile is another vehicle that can take flight when necessary.

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[[folder: Real Life ]]

* Hovercraft, though not the miracle originally hoped for, are effective ferries and possibly the only 'surface' vehicle that can cross minefields safely.
* Many examples under AmphibiousAutomobile.
* A few tries at FlyingCar.

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