> For the complete documentation index, see [llms.txt](https://gley.gitbook.io/mobile-traffic-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gley.gitbook.io/mobile-traffic-system/complete-api/setenginevolume.md).

# SetEngineVolume

### Description

Control the traffic vehicles' engine volume from the master volume.

### Declaration 

```csharp
public static void SetEngineVolume(float volume)
```

### Parameters

<table><thead><tr><th width="188">Name</th><th>Description</th></tr></thead><tbody><tr><td><strong>volume</strong></td><td>Current vehicles' engine AudioSource volume.</td></tr></tbody></table>

### Example

```csharp
using Gley.TrafficSystem;
using UnityEngine;

public class Test : MonoBehaviour
{
    //a reference to vehicle pool and player assigned in inspector
    public VehiclePool vehiclePool;
    public Transform player;

    void Start()
    {
        API.Initialize(player, 20, vehiclePool);
    }

    public void SetVolumeToHalf()
    {
        API.SetEngineVolume(0.5f);
    }
}

```