IRL you can 'honk' with a siren setup or have it play high attention mode where another kind of siren loop plays and light flashes more intensively. I guess that is called rumbler siren in english. (Amazing how no one in that place is paying attention to their surroundings)
Is it possible to hook that to different light flashing pattern too somehow? I really don't know anything about horn and lightbar modding, but I know it is possible to make custom keybindings to actions via lua.
Siren system needs a rework. Bullhorns and airhorns should be added. Electric sirens should have multiple tones that can be rapidly switched. (Wail, yelp, etc) Mechanical sirens should rev when activated and a siren brake feature should be added.
