Aquamenti

This modification requires Siren Mastery by Albo1125
This is a simple and compact, yet aesthetically satisfactory UI for Albo1125's Siren Mastery, based on the real life Code 3 H2 Covert handheld siren system.
You can read more about the H2 Covert at Code 3's website - http://www.code3pse.com/products/product_info/Fire/Sirens/C_35S#

The UI scaling factor pictured in the screenshots is 0.75.

The UI works with all vehicles, but is best suited for up to 7 sirens. Sirens 8 - 10 share a common, generic button.
By default, it's configured so that sirens 1 and 5 are Primary, siren 4 is horn. To edit, rename files in the /UI/On folder.

I'm sure this one doesn't require a long introduction. The Ubermacht Oracle XS is at your service!
This model is a standalone (add-on) model. 
Recommended vehicles and carvariations meta lines included Windows, lights, dials and collisions work as they should The vehicle is fully mapped.  
This lore-friendly model is unlocked. Also, for texture editing, you can find a template, .psd and the original textures in the optional separate download.
 
Share/request liveries or keep up to date with my other content in my showroom thread:

She may not look like much, but will get the job done regardless. The Vapid Radius is ready to join your fleet.
This model is a standalone (add-on) model. 
Recommended vehicles and carvariations meta lines included Windows, lights, dials and collisions work as they should The vehicle is fully mapped.  
This lore-friendly model is unlocked. Also, for texture editing, you can find a template, .psd and the original textures in the optional separate download.
 
Share/request liveries or keep up to date with my other content in my showroom thread:

Apparently there's demand for an alternate transport model, so here's Pony. 
Mapped and templated, completely lore-friendly and unlocked as always. 
 
Starting with v1.10, files needed for texture editing are separated to reduce the download times of the vehicle files as the .psd is quite sizeable.
I've also made three variants available for the Pony, all of which are separate downloads:
Brute Pony with an LED lightbar configuration (pony3) Brute Pony Unmarked/Slicktop - with LED lights (pony4) Brute Pony with a rotator lightbar configuration (policet replacement) Click "Download this file" and then make your choice. Or get any combination of the vehicles, they don't overlap in the files.
All three have multiple livery support, use the files provided in the (Optional) download to customize your van.
 
Share/request liveries in my WIP and showroom thread, or just keep up to date with my other content:
 

I don't know what to say. The Department has been made to cut expenses and they're taking it out on the frontline worker - you're driving an estate now. 
This standalone vehicle, converted by the IV Pack team, has been touched up to fill the more basic needs of law enforcement duties, but owing to its native interior you'll be sitting in a ditch and there's no bulkhead to guard you from the perils of the back seat. Yes. They're cutting back everything.
I deemed the original handling lines absolutely unsuitable for a police vehicle, so until I learn how to tweak them, the car's RWD and acts like a Stratum - shouldn't be a problem.
Features list
Carvariations and vehicles .meta lines No windows, dials, pushbar or dirt mapping bugs The vehicle is mapped and templated for your customization experience If you want to showcase or request textures for this vehicle, or check out my other content, visit my WIP and showroom thread: 
 

The Annis Pinnacle from GTA IV has made its way to LSPD. Will it be the pinnacle of your fleet? 
This lore-friendly vehicle, converted by the IVPack team, is now fully equipped for active duty and is waiting to hit the road.
Recommended handling, carvariations and vehicles.meta lines included Compatibility for police2 replacement Breakable windows, working dials, functional push bar Dirt mapping is preserved, looks natural The vehicle is mapped & templated - 4 LSPD liveries and an exemplative .psd included! If you want to showcase or request textures for this vehicle, or check out my other content, visit my WIP and showroom thread: 
 

I've converted this default GTA V car to a police vehicle. The model makes use of carcols edits, and provides amber emergency lights under the rear window and on both sides of the roof (check the pictures). Also included in the package is a variant with standard siren values and no amber lights.
The car is optimized for Radiance V, but will work regardless.

Features list:
(Optional) Carcols lines and an optional replacement file for amber rear LEDs and side-facing strobes Carvariations and vehicles.meta lines, although the model could probably replace police2 Breakable glass and functioning dials Default dirt mapping is preserved Detailed UV-mapping of the vehicle and a template for custom liveries Eight high quality LSPD liveries with a .psd for an example The model is unlocked and community edits and improvements are encouraged. Use the template and make me proud.