> 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/sethazardlights.md).

# SetHazardLights

### Description

Enable/disable hazard lights for a vehicle.

### Declaration 

```csharp
public static void SetHazardLights(int vehicleIndex, bool activate)
```

### Parameters

<table><thead><tr><th width="188">Name</th><th>Description</th></tr></thead><tbody><tr><td><strong>vehicleIndex</strong></td><td>The index of the vehicle.</td></tr><tr><td><strong>activate</strong></td><td>true - means hazard lights are on.</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 TurnHazardLightsOn()
    {
        API.SetHazardLights(0, true);
    }

    public void TurnHazardLightsOff()
    {
        API.SetHazardLights(0, false);
    }
}

```