Police siren can be heard from mechanic vehicle at long distance (lightbar only)

FiveM Server Development Resource Support
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1

Hi everyone,

I’m having a strange issue on our FiveM server.

We have a mechanic vehicle that only has a lightbar. The lightbar can be toggled on and off with the E key, and the vehicle does not have a siren.

However, when the lightbar is turned on and the mechanic vehicle drives away, at a certain distance a police siren suddenly becomes audible, even though no siren is active. As soon as the vehicle gets closer again, the siren disappears.

It seems like the game starts playing a distant emergency vehicle siren instead of just rendering the lightbar.

Has anyone experienced this before or knows what could cause it? Is there a way to prevent the distant police siren from playing on vehicles that only use emergency lights?

Any help would be greatly appreciated. Thanks!

2

At some point, either you optimized the resource that is handling sirens or installed a resource that tried to optimize them.

Try to look for something handling DistantCopCarSirens. This happened to us when we refactored/optimized LVC, leading to “ghost sirens” like you’re describing.

CreateThread(function()
    while true do
        Wait(16)
        --- This needs to be continually set or else an emergency vehicle can get in such a state that it continually plays these sirens.
        DistantCopCarSirens(false)
    end

we found 16 ms “enough” that players can’t hear the ghost siren, if you’re using LVC you just have to take a performance hit on this unfortunately.

3

Thanks, I’ve inserted it like that. It works!