Maybe you should not blame the uploader for your blunt intellect...???
Just open the policing.ini - file with a text editor, find or change the keys. As doing in so many other scripts...
How to install this script on top of LCPDFR is pointed out in the About this Script.txt
You have to run LCPDFR too. Press ALT+P, drive to the next police station and step into the red circle. Follow the explainings.
When you choosed a car stop the call-outs from LCPDFR by pressing F7 and then, to just get the ones of Braveheart's scripts, press the keys you defined for "Available for calls", default ist
[AVAILABLE FOR CALLS]
AVAILABLE = ALT
AVAILABLE2 = DELETE
what means press ALT+DELETE
It's a shame how many dumb people are shouting to uploaders, who offers such great work FOR FREE, instead of using their brain! No wonder there're less updates on such great scripts.
Did you try to press "J" (by defaults) for the main lights and "K" for the secondary ones? All the keys are specified and written down in the ini-file...