Separate names with a comma.
Holy Cackle! Heavy Industrial Vehicles!
Have you used the vehicle groups manager?
The file at the bottom of this linked page might achieve what you want the horn to do...
https://documentation.beamng.com/tutorials/ai/ Use the AI control app, you could increase risk or route speed
https://www.beamng.com/resources/uzl-camera.31814/ You might be able to use this as an interior camera
What your looking for is a grey tab that’s right under the “Stock Traffic Groups Addon” download this is what it should look like