budziolek

Thank you! All works :)
+thanks for translate

Hi, it sounds like you're not using any graphics enhancers, so you're just experiencing default graphics. Here's what I recommend (please install in that order):
Visual V, available on GTA5-MODS.com at this link. (I don't use the optional settings personally.) Radiance V, available onf LCPDFR.com at this link. (I don't use the optionals here, either. I would recommend tinkering with the different settings presets though.) These mods will reset your monitor resolution to 800x600 (bad resolution), but you can turn it back up in the settings menu. I'd also recommend turning up shader effects (in that menu also).
 
I also ran the above text through Google Translate for you, maybe it'll help, maybe it'll be an awful translation!
 
 
Happy playing!

You can change it in the config files of the cars
Change the <LstgActivationType> to auto like this:
 
        <LstgActivationType>auto</LstgActivationType>
 
Now you can turn the siren on immediatly after pressing J and enabling the lights.