This is the Swedish Siren mod which adds the swedish siren to the game (duh)
This is my first mod ever, so I know it doesn't have the best audio, but I hope you will survive.
How to install
When you download this, you will get a zip file, place that into the mods folder under Documents/BeamNG.drive/mods
How to use
Spawn any car with a customizable lightbar which looks like this: https://gyazo.com/2726e81ee5ae3375f4b22ed50b0572b3
Then select "Swedish Siren" under the "Siren Audio" tab.
Now you are good to go!