How to Make a Track for Assetto Corsa

Building a custom track for Assetto Corsa is one of the most rewarding things you can do in sim racing — your own circuit, your own corners, AI cars racing a line you designed. It's also, traditionally, a lot of work. This guide walks through what making an AC track actually involves, and shows you the fastest route from a blank page to a circuit you can drive: draw it in RacetrackDesign and download a ready-to-go Assetto Corsa package.

What "making a track" for Assetto Corsa actually involves

An Assetto Corsa track isn't a single file — it's a small bundle of things that all have to agree with each other:

• A 3D mesh for the road, kerbs, grass and walls, with correctly named surfaces so the physics engine knows what's tarmac and what's run-off.
• A surfaces.ini mapping each surface to grip, dirt and audio.
• An AI fast lane (fast_lane.ai) so the AI drivers know where to go and how fast.
• Pit boxes, a start grid and timing gates (AC_PIT_, AC_START_, AC_TIME_ objects) so sessions, the lap counter and the pit lane work.
• UI metadata — ui_track.json, a map.png minimap, and a preview image — so the track shows up properly in the menus.

Get any one of those wrong and the track either won't load, won't lap-count, or the AI drives into a wall. That's why hand-built tracks take a while.

The traditional route (and why it takes weeks)

The classic modding workflow looks roughly like this:

1. Model the circuit in Blender (or 3ds Max) — lay out the road surface, kerbs, grass, barriers and terrain, then unwrap and texture it. This is the bulk of the time and the steepest learning curve.
2. Name every surface correctly so AC's exporter recognises ROAD, KERB, GRASS, WALL and so on.
3. Export with the Kunos tools (the ksEditor / FBX pipeline) into AC's content/tracks format.
4. Place the pit, start and timing objects by hand in the editor — get the left/right timing-gate handedness wrong and the lap counter silently breaks.
5. Record or generate the AI line, then fix up the racing line, side lines and hints so the AI is competitive.
6. Write the UI files, draw a minimap, and grab a preview screenshot.

None of it is impossible, but it's days-to-weeks of 3D and config work before you can drive a single lap — and most track ideas die somewhere in step 1.

The fast route: design it in RacetrackDesign

RacetrackDesign collapses that pipeline. You draw the layout — the part you actually care about — and it generates the AC package around it: the 3D mesh, the AI racing line, the track boundaries, the pit lane, the minimap and the UI metadata, zipped and ready to drop into your sim.

Here's the whole flow.

Step 1 — Sketch your circuit

Open the designer and place points to shape your track. You can start from a blank canvas for a fantasy layout, or switch to the satellite map and trace a real road or an existing circuit point by point. Adjust track width, corner radii and elevation as you go.

Step 2 — Add a pit lane and start/finish

Assetto Corsa exports require a pit lane, so make sure your track has one along with a start/finish line. RacetrackDesign uses these to stamp the pit boxes, the starting grid and the timing gates into the export automatically.

Step 3 — Validate before you commit

Before you export, get instant analysis on safety, overtaking potential and FIA-style grade, and run a lap simulation across car classes. This is the cheap way to kill a bad layout early — far better than discovering a corner doesn't work after you've built it in 3D.

Step 4 — Export to Assetto Corsa

Open the export menu and choose Assetto Corsa (.ai). RacetrackDesign builds a ZIP containing everything AC needs. Tick include real-world terrain if you traced a real location and want the surrounding ground baked in.

New here? Sign up and your first Assetto Corsa export is free — draw a track and download a real package before deciding whether to upgrade.

Step 5 — Install it in Assetto Corsa

Unzip the download into your Assetto Corsa tracks folder:

Steam\steamapps\common\assettocorsa\content\tracks\

Launch the game, pick your track from the menu, and drive. The AI line, pit lane and timing are already in place.

What's in the export

Component	What you get
3D mesh	Road, kerbs, grass and terrain surfaces, correctly named for AC
AI fast lane	Racing line computed from a physics-based lap simulation — not just a centreline offset
Track boundaries	Left/right limits so the AI stays on track
Pit lane & grid	Pit boxes, start positions and a prominent start/finish marker
UI package	ui_track.json, minimap PNG, preview and a README with install steps

Tips for a track that drives well

• Vary your corners. A mix of slow hairpins, medium sweepers and fast kinks is more fun to drive — and the analysis tools reward it.
• Use elevation. Flat tracks feel sterile. Even gentle gradients transform how a circuit drives.
• Leave room for run-off. Generous track width and run-off both improve your safety score and make the AI racing line cleaner.
• Keep the pit lane sane. A clean pit entry and exit avoids the AI bunching or pitting badly.

Key takeaways

• A real Assetto Corsa track is a bundle — mesh, surfaces, AI line, pit/timing objects and UI files — and they all have to line up.
• Hand-building one is a weeks-long 3D-modelling job, which is where most ideas stall.
• RacetrackDesign lets you draw the layout and download a ready-to-drive AC package, with the AI line, pit lane and minimap generated for you.
• Validate the design first, add a pit lane, export to Assetto Corsa, and drop the ZIP into content/tracks.

Want the full sim-racing picture, including rFactor 2? See the sim racing track builder overview — or just start drawing.