LukeD1287

I've found with a lot of FiveM servers you get some of the following:
SIREN_PA20A_WAIL - Police Wail 
AIRHORN_EQD - Police Bullhorn/Airhorn
(Yelp and Priority Tones are typically stock)
SIREN_FIRETRUCK_WAIL_01 - Firetruck Wail
SIREN_FIRETRUCK_QUICK_01 - Firetruck Secondary
 
I'm not fully sure how I got these extra tones, but some FiveM setups use these so I figured I'd post it. Be sure to install stock versions and these as servers can vary.

Zu Deutsch wechseln We should be grateful for everything that is done here. If one can do it better then he should do it. Of course it would be great if it comes soon, but these are people who sacrifice their free time, so you could be more grateful. If it is already free, you can not claim! Wait, however, full of impatience.

If people continue to ask when the mod is released the answer will be when half life 3 is announced,
be patient people. Sam and the others have put a lot of hard work into this, you can't rush art!

" Computer scientists are taught to program properly, just like linguists are taught how to write literary texts. However, not all computer scientists are programmers, just like not all linguists are writers, although most of us program regularly. For some reason, many programmers seem to think their role is to write code that makes things work. It’s not. Your job is to solve a problem with code in the most elegant way, such that your solution is easy to adapt, modify and reuse. Just like “the grass is green and the sky blue” is not literature, although it might perfectly describe the environment, coding something that just works™ is not programming. It’s fiddling. "
 
Ruben Verborgh, professor of Semantic Algorithmic technology, 2013

It's not a new game, it's an update. A big one, I agree on that, but "just" an update none the less.
I know some things like the improved AI must have taken a lot of time and tweaking to achieve what we're going to see in this release.
But it doesn't seem like a "3 years" kind of workload. I don't know how many devs are behind LSPDFR but I imagine just a few as it took 3 years.
If they don't have enough time to work on it, nothing stops them from getting more people involved. The community for this mod is huge and I'm sure a lot of very competent developers dream of working with them to improve the mod.
With that said, I have a huge respect for those actually working on LSPDFR. A big community means a lot of pressure and expectation, and I'm sure they do their best.