Circuits that don't exist: how video game tracks are designed

Ask a generation of racing fans to name their favourite circuits and somewhere on the list, alongside Spa and Suzuka, you will find tracks that have never existed. Trial Mountain. Deep Forest. Maple Valley. Millions of laps have been driven on them, their corners are debated with the same seriousness as Eau Rouge, and not one metre of them has ever been paved.

Fictional circuit design is real circuit design — done by people studying the same geometry, the same rhythm, the same overtaking physics — but with the constraint set rewritten. Some real-world rules vanish entirely. Others, invisible in the real world, become absolute. For anyone who designs tracks for fun, including everyone who has ever opened our designer, the fictional circuit is the purest form of the craft: nothing but the layout, judged by nothing but how it drives.

Two crafts, not one

Modern racing games contain two completely different kinds of track work, and it's worth separating them. The first is reproduction: real circuits captured by laser scanning, where survey equipment records the track surface down to individual bumps and kerb edges, producing point clouds accurate to within millimetres. Simulators built this way — a movement that titles like iRacing and Assetto Corsa pushed into the mainstream — are exercises in fidelity. The designer's judgment was exercised decades ago by whoever built the real circuit; the game's job is transcription.

The second craft is invention, and it is the interesting one. An original circuit for a game starts exactly where a real circuit starts — a route, a rhythm, a set of corners — but the designer answers to players instead of the FIA. Polyphony Digital's original Gran Turismo circuits and Turn 10's Forza originals are the canon here: tracks designed from scratch, iterated against playtesting rather than homologation, and kept in the public's hands for decades. They are, in effect, the largest body of experimental circuit design ever produced — thousands of layouts tried, and a tiny handful that players refused to let die.

The rules fictional tracks get to break

Strip away physical reality and entire chapters of the circuit design handbook become optional. Safety geometry goes first: a fictional track needs no run-off calculations, no barrier specifications, no medical access roads. Trial Mountain's most famous feature — a corner threaded between rock faces, with a wall tight on the exit — would never survive a real-world safety inspection, and it is precisely what makes the corner unforgettable. Where modern real circuits surround drivers with consequence-free tarmac, fictional ones can reintroduce consequences at will, and players love them for it.

Terrain is free. Moving a million cubic metres of earth costs a real developer a fortune; a game designer types a number. So fictional circuits use elevation the way real designers only dream of — Deep Forest's tunnels and plunging gradients, mountain passes with the vertical drama of the old Nürburgring, corners hung on cliffsides no insurer would touch. Land acquisition, noise regulations, drainage, the neighbours: all gone. The economics that bankrupt real circuits simply do not apply.

Even the loop itself is negotiable. Point-to-point hillclimbs, figure-eights with bridges, rally stages through fictional villages — shapes that real-world spectator logistics and land costs killed a century ago survive happily in games.

The rules fictional tracks cannot break

What makes the craft serious is what survives the move into fiction. The physics of racing do not care that the track is imaginary. A fictional circuit with no heavy braking zone at the end of its longest straight produces processions in multiplayer, exactly as it would in reality. Constant-radius corners are as numbing rendered as paved. Rhythm — the alternation of fast and slow, commitment and patience — matters identically. Every principle in the real design canon applies, because the cars in a good simulation obey the same equations as the cars at Silverstone.

And games add constraints reality never had. A fictional track must be learnable: players meet it with no testing, no track walk, no engineer, so the layout has to teach itself — distinctive corner landmarks, readable sight lines, a shape that fits in memory after three laps. It must be durable: a real circuit hosts one race weekend a year; a game circuit might be driven ten thousand times by a single player, so subtleties that reveal themselves slowly are worth more than spectacle that exhausts itself quickly. It must work for wildly mismatched machinery, because the same corners will be taken in a 70-horsepower hatchback and a prototype racer. And in the online era it must survive the first-corner pileup: game designers learned, just as real designers did, that a tight first corner after a long straight is a wreck generator — only their data set is millions of races deep.

Memorability turns out to be the hardest constraint of all. The fictional circuits that endured for decades are not the most extreme ones; they are the ones with three or four corners a player can name, describe, and argue about. That is the same property that puts real circuits on all-time greatest lists. It is apparently a law of the form.

What game tracks taught real designers

The traffic between the two worlds now runs in both directions. Simulation became a standard tool of real circuit development: layouts are driven virtually, by professional drivers, before earth is moved, and design problems that once surfaced on opening day now surface in a rig. Several modern circuits were tuned this way — corner radii adjusted, sight lines checked, kerbs reshaped — with the simulator acting as the cheapest prototype in engineering history.

The deeper lesson from games is about iteration speed. A real circuit designer gets a handful of projects in a career and almost no chance to revise a built mistake. A game studio can test fifty variants of one corner in a week against telemetry from thousands of players. The fictional canon — which corner shapes players replay, where overtakes actually happen, which layouts stay fun on lap five thousand — amounts to an empirical answer key for questions real designers could previously only argue about. It is not a coincidence that the consensus on what makes corners great has sharpened in the same decades that millions of people started driving them virtually.

That iteration loop is exactly what this site exists to give you. Sketch a fictional circuit in the designer and hold it to the fictional designer's standard, which is the real designer's standard with the excuses removed: no budget to blame, no land constraints, no committee. Just a loop, a speed map, and one question — would anyone remember these corners? Trial Mountain says the bar is high. It also says a track that exists only as a drawing can outlive most of the ones made of asphalt.