It would be cool if this will be added. It looks nice and fitting for the game I think players would like this mod.
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Police lights.
Link for the lights: https://www.gtaall.com/gta-san-andreas/cleo/75937-cool-police-lights.html
It's a third party mod. Players can download and install it use it but it cannot be scripted. Mike already scripted emergency light which you can toggle by pressing n.
*sad gamer noises*