Car List Editor

The Car List Editor is the only place in the TrafficTool where you decide which cars spawn at all and how often each one shows up relative to the others. Everything else in the tool consumes a list — Performance Presets, Traffic Density, Police Chases, Race Cars — so the list you pick here is the character of your traffic. A Japan-only JDM list produces different traffic than a European family-car list, even at identical density settings.

Where to find it

On the Main tab, the Car List row shows a dropdown for the active list and a purple Edit button. Picking a different list from the dropdown applies it instantly and refreshes traffic. Clicking Edit opens the full editor window. Selecting (create custom list) opens the editor pre-loaded with every installed car, ready for you to tick.

How the chance system actually works

Every enabled car in a list has a single number: its chance. Chance is not a probability; it is a relative weight. When the tool needs to spawn a car, it picks one at random from the enabled entries and biases that choice by weight. A car at chance 100 is five times as likely to be picked as a car at chance 20, regardless of how many total cars are in the list.

This matters for two reasons:

Absolute values mean nothing. A list where every car is at 50 behaves exactly the same as a list where every car is at 100 — the ratios are identical. Do not “increase chances” hoping to see more cars overall; that is the job of Traffic Density, not the chance slider.
Rare things should be rare. Push hypercars and exotics down to 10 – 20, keep family sedans at 100. You will occasionally see the exotic, which is how real traffic feels. If every car is at 100 your freeway ends up looking like a video-game car park.

Right-clicking the chance slider reverts that single car to its last saved value — useful after you mess with a row and want to abandon just that change.

How to disable cars you don’t want

The checkbox on the left of each row is a hard on/off for that model. A disabled car is still in the list but never spawns. This is how you keep buses out of a mountain-pass scenario, or hypercars out of a rush-hour list.

Disabled rows are hidden from the table by default to keep the view tidy. You only see them again after clicking Add New Cars (which puts the tool into “show me everything” mode so you can pick from the full catalogue) or by toggling a row from enabled to disabled yourself.

How to build a themed list from scratch

Pick (create custom list) from the dropdown on the Main tab. The editor opens with every installed car listed and disabled. From here:

Click Select All once to flip all rows to enabled, or leave them all off if you only want to enable a handful.
Manually tick exactly the cars that fit your theme. For a JDM list, tick Japanese sedans, coupes, kei cars; leave the rest off.
Tune chances so rarity feels natural — push exotic models down, keep daily-driver models high.
Click Save As and give the list a name like jdm-night. The list appears in the Main tab dropdown and can be activated with one click from now on.

Each custom list is just a small JSON file in the TrafficTool’s preset folder. You can copy it to other installs, share it in a modpack, or back it up like any other file.

How to fork a shipped list without breaking it

The shipped lists (default, JDM, USA, etc.) are a shared baseline. If you want to alter one without losing the original, open the list in the editor and use Save As with a new name instead of Save. Save always overwrites the current list’s file; Save As writes a new file and switches the active list to your copy.

This is the safest way to experiment. The original is untouched, your variant lives beside it in the dropdown, and you can always go back.

How to add newly installed car mods

When you install new car mods in Assetto Corsa, the TrafficTool does not automatically put them into your lists. They are there on disk, and the editor can see them, but they are not part of any list until you add them. That is by design — you decide which new mods are traffic-worthy.

Open your usual list in the editor.
Click Add New Cars. The tool scans for cars that are not yet part of the list and appends them as disabled rows. A toast tells you how many were found.
The editor switches to “show disabled” mode so the new rows are visible.
Tick the ones you want, adjust their chance, and Save.

The editor ignores car entries whose model, LOD or collider files are missing on disk, so a broken mod is simply skipped. That prevents a single bad install from breaking your entire list.

How to reset your edits

Two different reset buttons cover two different mistakes:

Reset List — reloads the list from disk and throws away every un-saved change you made in this editor session. The equivalent of closing without saving. Does not delete the list.
Reset Chance — sets every car’s chance to 100 but leaves the enabled/disabled pattern alone. Useful when you want to start a re-balance from a clean slate without losing hours of checkbox work.

License plate style

When developer mode is on, the editor exposes a plate-style dropdown at the top. The setting is a property of the whole list (not per car): every traffic car spawned from this list will carry European, USA or Japanese plates. Keep this aligned with the list’s theme — a JDM list with USA plates looks wrong, and the tool will happily let you make that mistake.

How Performance presets can auto-filter the list

When the Performance Preset is set to Low, the tool automatically marks about half of the enabled cars in the active list as filtered, to keep model memory bounded. A yellow banner inside the editor tells you how many were auto-disabled and by which rule.

This auto-filter is a soft limit: you can manually re-tick any filtered row and the tool will respect your choice. Use that to protect essential models (the taxi cab, the police car) that must be in rotation even on Low.

Interaction with other features

Police Chases: rely on a car in the list having the police role. A list without one never spawns police, regardless of the master toggle.
Race Cars: the pool of racers is pulled from the sporty models in your list. A list of only utility vehicles has nothing to promote.
Traffic Density: boosts count uniformly; it does not change the mix. If you want more motorbikes, the chance slider handles that, not density.
Extra Cars: use the same list. So a themed list also themes the distant background cars.

Troubleshooting

I enabled a car but never see it: Chance may be 0, or another car with a much higher chance is drowning it out. Raise its chance, lower the dominant car, or temporarily disable the dominant one to prove it can spawn.
Save is greyed out: You are editing (create new list). Use Save As first to give the list a file name.
Yellow “N car types auto-disabled” banner: You are on Low Performance. The auto-filter is active. Either switch to Mid/High for the full list, or manually re-enable the cars that must stay in rotation.
My new car mod doesn’t appear: Click Add New Cars. If it still is not listed, the mod is missing a model, LOD or collider file on disk.
I want different lists per track: Not yet possible — the active list is global. Switch lists manually when you change tracks; Performance and Traffic Levels remember per-track but the list does not.