What this mod does is it lets AI Police change there siren(s). So they will use AirHorn/Yelp/Priority. This is Disabled Multi-Player as it may change other peoples sirens.(Single-Player use only) I got this idea when "lcpdsergeant" Posted on the LCPDFR Forums about AI Police using "Yelp" Siren.
Video
Chip, Arturs = Scripting
lcpdsergeant = Idea
lcpdsergeant = Idea