Make the cars the way you want but try to make them have separate sirens and separate flashing lights button.
Also if you need Ideas for this project I will help as much as I can. I would make the cars if I could edit the vehicles much easier like how Google sketchup is.

Impala174: You're clearly aware of the existence of the addon request topic, as I see you've posted there before. You've also gone and created two topics within a few minutes of each other, basically asking the same thing.

+1wb +48hr PR. Please familiarize yourself with the rules before posting again, as to avoid any further incidents