> ## Documentation Index
> Fetch the complete documentation index at: https://help.freakhosting.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Set Up AI Traffic in Assetto Corsa

> Master the configuration of AI traffic for your Assetto Corsa server. Learn how to use the CSP Server Wrapper to create immersive highway and city environments.

## 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.

<CardGroup cols={2}>
  <Card title="Difficulty" icon="gauge-low">
    Advanced
  </Card>

  <Card title="Time" icon="clock">
    15 Minutes
  </Card>
</CardGroup>

***

## Technical Infrastructure Requirements

Before attempting to initialize traffic logic, verify that your server environment meets these critical prerequisites.

<Tabs>
  <Tab title="AI Splines & Paths">
    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.
  </Tab>

  <Tab title="Custom Shaders Patch (CSP)">
    Synchronized traffic requires the **CSP Server Wrapper**. This extension enhances the base game engine, allowing it to broadcast AI positions and states to all participating drivers with high precision.
  </Tab>
</Tabs>

***

## Implementation Procedure

Follow these steps to deploy and calibrate your traffic system.

<Steps>
  <Step title="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.
  </Step>

  <Step title="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.
  </Step>

  <Step title="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.
  </Step>
</Steps>

***

## Advanced Optimization

<AccordionGroup>
  <Accordion title="Traffic Planner Integration">
    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.
  </Accordion>

  <Accordion title="Performance Tuning">
    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.
  </Accordion>
</AccordionGroup>

<Warning>
  ### 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.
</Warning>

***

<Note>
  ### Need Extra Help?

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  * **Live Chat:** Quick assistance via our website.
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</Note>

<Tip>
  ### Save on Your Hosting

  Ready to get a new server? Use code **KB20** at checkout for **20% off** your first month!
</Tip>

***

<div align="center">
  **Last Updated:** January 2026 | **Traffic:** Immersive highway simulation.
</div>