You can install client side mods but I think this won’t work for other players, as this script is not designed to multiplayer even not for FiveM.
You can control your sirens in FiveM synced with this script:
You can install client side mods but I think this won’t work for other players, as this script is not designed to multiplayer even not for FiveM.
You can control your sirens in FiveM synced with this script: