Skip to main content

​
Populating the World

Driving on expansive city or highway maps, such as the Shutoko Revival Project (SRP) or LA Canyons, can feel isolated without a consistent flow of traffic. However, the native Assetto Corsa dedicated server does not include a synchronized AI traffic system for multiplayer environments. To achieve a realistic and immersive “life on the road” experience, you must use specialized server wrappers and logic files that coordinate AI entities across all connected clients.

Difficulty

Advanced

Time

15 Minutes

​
Technical Infrastructure Requirements

Before attempting to initialize traffic logic, verify that your server environment meets these critical prerequisites.
Every track utilized for traffic must contain a valid fast_lane.ai file within its data directory. This file serves as the mathematical path that the AI entities will follow throughout the map sectors.

​
Implementation Procedure

Follow these steps to deploy and calibrate your traffic system.
1

Configure the Entry List

Open your entry_list.ini file and populate it with specialized “Traffic Car” models. These are typically low-poly versions of standard vehicles designed to minimize the performance impact on both the server CPU and your players’ frame rates.
2

Define Traffic Logic

Access your extra_cfg.yml file (part of the CSP configuration) and navigate to the traffic section. Here, you can define parameters such as density, minimum/maximum speeds, and lane-changing behavior.
3

Initialize & Verify

Restart your server via the console. Upon joining, verify that the AI entities are spawning correctly at the designated points and adhering to the defined speed limits without causing desynchronization.

​
Advanced Optimization

For the most sophisticated setups, we recommend using a JSON-based Traffic Planner script. This allows for dynamic spawning based on player proximity, significantly reducing the server’s resource footprint while maintaining the illusion of a densely populated world.
If your server experiences FPS drops or “Checksum Mismatch” errors, reduce the number of active traffic slots in your entry list. Each AI car requires a dedicated network slot and contributes to the overall CPU load of the host node.

​
Collision Synchronization

Ensure that all players joining your traffic server are using a compatible version of the Custom Shaders Patch on their local machines. If a player has a different version, they may see AI cars in different positions, leading to unavoidable and frustrating collisions.

​
Need Extra Help?

If you encounter any issues, our support team is ready to assist:

​
Save on Your Hosting

Ready to get a new server? Use code KB20 at checkout for 20% off your first month!
Last Updated: January 2026 | Traffic: Immersive highway simulation.