Do I need the base map for Stockholm by 4R?

Yes — this mod adds traffic/pedestrian data to an existing map, so you must install the base map first.

2REAL — Stockholm by 4R Traffic Mod

For Assetto Corsa • Powered by the 2REAL Traffic Tool (2REAL App)

Track: Stockholm by 4R
Location: Stockholm, Sweden
Length: 21.3 km / 13.3 mi
Type: Highway / Open-world freeroam
Released: 2024
Track by: 4R

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What this mod does

Realistic traffic simulation for the Stockholm by 4R map. Spawns up to 2,000 AI traffic cars across all lanes of the highway, with additional roadside vehicles in service roads and parking areas to make the city feel inhabited.

You're adding a full traffic AI layer to Stockholm by 4R. The lane definitions and spawn weights are baked in; the live behavior — gap rules, lane changes, indicators, density — is driven by the 2REAL Traffic Tool (2REAL App), which you can tune in real time from the in-game phone UI.

Where you'll be driving: Stockholm by 4R

A recreation of Stockholm's highway system in Sweden — drive from Stadshagen across the iconic Essingeleden corridor toward Lidingö bridge, through tunnels, bridges and scenic mountain passes. The map captures one of the most iconic backdrops of the modern underground street-racing scene, with all the major waypoints car culture fans recognize from the city. Get the base map here: Stockholm by 4R.

Pairing with the 2REAL Traffic Tool (2REAL App)

The 2REAL Traffic Tool (2REAL App) is the engine that powers traffic and pedestrian behavior at runtime. For Stockholm by 4R, these App features are particularly relevant:

Traffic Density — set spawn density per zone — highways like Stockholm by 4R work especially well with high density paired with realistic gap rules.
Traffic Features — toggle indicators, brake lights, lane changes and other behaviors that bring the AI cars on Stockholm by 4R to life.
Performance Presets — if you run a busy car build, switch to a lighter preset — important on long open maps like Stockholm by 4R.

How to install

Install 2REAL Traffic Tool (2REAL App) (drag the App package into Content Manager).
Install the base map: Stockholm by 4R.
Place the included traffic.json into the track's /data folder (e.g. assettocorsa/content/tracks/4R_Stockholm_0_9_2/...).
Launch Assetto Corsa, load the track in Practice mode, and open the 2REAL Traffic Tool (2REAL App) in-game.
Tune density, lane behavior and other settings from the in-game phone UI.

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Common questions

Does this mod require the 2REAL Traffic Tool (2REAL App)?

Yes. The traffic and pedestrian behavior is driven by the 2REAL Traffic Tool (2REAL App). The mod ships the spline data; the App spawns and animates the AI at runtime.

Can I run this without a steering wheel?

Yes. The mod runs on top of standard Assetto Corsa — keyboard, gamepad and wheel are all supported. AI behavior on Stockholm by 4R is identical regardless of input device.

Is it compatible with the pedestrian mod for the same track?

Yes. Traffic and pedestrian mods are separate files that share the same /data folder — install both and they work together. Running both gives the most realistic city feel.

What's the recommended traffic density for Stockholm by 4R?

Start with the App's default density and tune from there. On highway-heavy maps, mid-to-high density feels natural; on city maps, lower density with more police presence often feels more realistic. See Traffic Density for the full reference.

Is this Patreon-exclusive or free?

Most 2REAL mods are tied to a tier on Patreon — the download button on this page checks your access automatically once you log in. Some mods are free; the button will reflect what tier (if any) is required.

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