# VEHICLE::START_VEHICLE_HORN

- **Hash:** `0xB4E3BFC39CA16057`
- **Namespace:** VEHICLE
- **Runtime name (Lua/JS):** `StartVehicleHorn`
- **Side:** client (game native)
- **Name status:** official
- **Documentation:** described
- **Since game build:** 1207
- **URL:** https://natives.borderlinerp.com/natives/VEHICLE/START_VEHICLE_HORN

## Signature

```c
void START_VEHICLE_HORN(Vehicle vehicle, int duration, Hash mode, BOOL forever);
```

## Parameters

- `vehicle` (`Vehicle`)
- `duration` (`int`)
- `mode` (`Hash`)
- `forever` (`BOOL`)

## Returns

`void`

## Description

Sounds the horn for the specified vehicle.

vehicle: The vehicle to activate the horn for.
mode: The hash of "NORMAL" or "HELDDOWN". Can be 0.
duration: The duration to sound the horn, in milliseconds.

Note: If a player is in the vehicle, it will only sound briefly.

## Usage

### Lua

```lua
StartVehicleHorn(vehicle, duration, mode, forever)

-- always available, by hash
Citizen.InvokeNative(0xB4E3BFC39CA16057, vehicle, duration, mode, forever)
```

### JavaScript

```js
StartVehicleHorn(vehicle, duration, mode, forever);

// by hash
Citizen.invokeNative('0xB4E3BFC39CA16057', vehicle, duration, mode, forever);
```

### C#

```csharp
Function.Call((Hash)0xB4E3BFC39CA16057, vehicle, duration, mode, forever);
```

- Hash parameters: the named function also accepts a string and hashes it for you; `Citizen.InvokeNative` needs the number — pass `joaat("name")` or a backtick literal like `` `name` ``.

*Sources: alloc8or RDR3 NativeDB.*