BogdanM

Los Santos Police Department liveries for LAPD 2010 Charger by AlexTolle.
Download the car mod from here:
Installation:
Replace the "charger_sign_1-4" inside police2.ytd and police2+hi.ytd with a textures from my pack (drag and drop or use the Replace button).

Los Santos Police Department liveries for Ford Explorer LAPD [2010-2015] by Desmond98.
Download the car mod from here:

-6x 2048x2048 LSPD liveries (+ 2 new bumper stickers)
-6x 2048x2048 LSSD liveries
Installation:
Replace the "explorer_sign 1-6" inside police3.ytd with a textures from my pack (drag and drop or use the Replace button). Delete the remaining 2 LAPD liveries if you want.
 
 
 

Los Santos Police Department liveries for 2014 Chevrolet Impala made by Bxbugs123.
This pack only contains the LSPD textures, download the car model from here:

-6x 4096x4096 LSPD liveries
-6x 2048x2048 LSSD liveries
Installation instructions:
Open police2.ytd then drag and drop all texture files from "2048px" or "4096px" folder, press Ok when asked (Choose import options window). Save police2.ytd and close OpenIV, start the game and you should see the new car textures.

These textures were created for F5544's new CVPI with MX7000 lightbar, but they should work with any other car mod that uses F5544's [DEV] CVPI.

To replace the sheriff cruiser, rename the car files from "police" to "sheriff" (keep the suffix +hi/_hi where it's needed) and use OpenIV to replace them inside "mods\update\x64\dlcpacks\patchday3ng\dlc.rpf\x64\levels\gta5\vehicles.rpf". Add the new textures inside "police.ytd" and/or "sheriff.ytd", depending on which ones you want to use. 
The pack contains:
-4x 4096x4096 LSPD liveries
-4x 4096x4096 LSSD liveries
-4x 2048x2048 LSSD liveries (the 2048x2048 LSPD liveries are included in the CVPI MX7000 car mod)
!!IMPORTANT!!
1)This probably only happens on low end graphics cards but if your game starts acting up (missing textures, cars not spawning) after installing the HD textures, you need to do this: Start OpenIV and enable Edit mode. Then open "police.ytd"/"sheriff.ytd", click on cvpi_sign_1/2/3/4 and click on Properties (top right corner), change Mipmap levels to 1. Do this for all 4 liveries. Your game should work just fine now.
2) If you are playing GTA5 on Normal texture settings and want to use the 2048x2048 LSSD textures, follow the steps above and make sure all 4 cvpi_sign files inside "sheriff.ytd" have "Mipmaps: 1". The texture will look the best this way.
 

Download the car mod from here:

Both textures come in 4096x4096 and 2048x2048 resolution.
Installation:
Replace the "tahoe_skin" inside tahoe.ytd and tahoe+hi.ytd with a texture from my pack (use the Replace button). The car doesn't support multiple liveries so there's only one version for each department.
Known bugs:
- Small areas of white paint on both side mirrors and on the right front wing. Feel free to try and find out which pixels are responsible because I gave up after one hour and 5 game restarts.

Los Santos Police Department liveries for 2015 Dodge Charger RT Police 2.0 made by KAMELKFB.
This pack only contains the LSPD texture, download the car model from here:
http://www.lcpdfr.com/files/file/8466-2015-dodge-charger-rt-police/
Installation instructions:
1) Download and install the new car model following the instructions provided in the link, or do this: 
 (Use OpenIV to replace "police2.yft", "police2.ytd", "police2_hi.yft", "police2+hi.ytd" in mods/update/x64/dlcpacks/patchday3ng/dlc.rpf/x64/levels/gta5/vehicles.rpf) - Don't forget to enable Edit mode.
2) Open police2.ytd then drag and drop all texture files from "LSPD Textures" folder, press Ok when asked (Choose import options window). Save police2.ytd and close OpenIV, start the game and you should see the new car textures. If you're still seeing the old texture after doing this, drag and drop the textures inside police2+hi.ytd as well.
!!IMPORTANT!!: If you are running the game on NORMAL textures quality, you should use the textures from "1600px" folder. The ones from 2048px folder might look smudged. If you are running the game on High quality textures or above, use the textures from "2048px" folder.
3) I've also edited the lights_all texture to make the brake light red instead of white. If you want to use it, put it in the same police2.ytd with the other texture.
Known bugs:
- the car model doesn't support more than one livery at the moment. That means all Dodge Charger cruisers that are spawned will use the same texture (have the same unit number).
You can check out similar textures for other vehicles here:
http://www.lcpdfr.com/profile/17181-bogdanm/content/?type=downloads_file
----------------
Since this pack only contains one texture and maybe some of you would like a different unit number, I can make custom ones for anyone who wants that. Just leave me a comment with the unit number, either 3 digits from 001-999 or the entire 6-digit shop number. When it's done I will quote your request and attach the new texture. The 404 number came to mind after spending 2 hours trying to understand why the game doesn't see multiple liveries, so "404 (livery) not found". 
-Thanks Jeff Favignano for using the texture!
http://www.youtube.com/watch?v=epoQnWB0hkA
 

Los Santos Police Department liveries for Police Interceptor Fedsig Arjent made by F5544.
This pack only contains the LSPD textures, download the car model from here:
http://www.lcpdfr.com/files/file/8543-police-interceptor-fedsig-arjent/
Installation instructions:
1) Download and install the new car model following the instructions provided in the link, or do this: 
 (Use OpenIV to replace "police3.yft", "police3.ytd", "police3_hi.yft", "police3+hi.ytd" in mods/update/x64/dlcpacks/patchday4ng/dlc.rpf/x64/levels/gta5/vehicles.rpf) - Don't forget to enable Edit mode.
2) Open police3.ytd then drag and drop all texture files from "LSPD Textures" folder, press Ok when asked (Choose import options window). Save police3.ytd and close OpenIV, start the game and you should see the new car textures.
!!IMPORTANT!!: If you are running the game on NORMAL textures quality, you should use the textures from "1600px" folder. The ones from 2048px folder might look smudged. If you are running the game on High quality textures or above, use the textures from "2048px" folder.
1999 CVPI LSPD textures:
Buffalo S LSPD textures:
http://www.lcpdfr.com/files/file/8683-buffalo-s-lspd-textures/

Los Santos Police Department liveries for "Buffalo S cop Whelen edge lightbar" made by F5544.
This pack only contains the LSPD textures, download the car model from here:
http://www.lcpdfr.com/files/file/8403-buffalo-s-cop-whelen-edge-lightbar/
Installation instructions:
1) Download and install the car model following the instructions provided in the link, or do this: 
 (Use OpenIV to replace "police2.yft", "police2.ytd", "police2_hi.yft", "police2+hi.ytd" in mods/update/x64/dlcpacks/patchday3ng/dlc.rpf/x64/levels/gta5/vehicles.rpf) - Don't forget to enable Edit mode.
2) Open police2.ytd then drag and drop all texture files from "LSPD Textures" folder, press Ok when asked (Choose import options window). Save police2.ytd and close OpenIV, start the game and you should see the new car textures.
IMPORTANT!!: If you are running the game on NORMAL textures quality, you should use the textures from "1600px" folder. The ones from 2048px folder might look smudged. If you are running the game on High quality textures or above, use the textures from "2048px" folder.
3) I've also added a clear glass lightbar texture. If you want to use it, put it in the same police2.ytd with the other textures.
Known bugs:
- part of the side view mirror and the front door frame overlap in the texture template so by coloring the mirrors in black, a small section of the door frame is also black instead of white. The black mirrors look much better so I'm willing to compromise.
- minor color misplacements here and there. 
If you are using the 1999 CVPI made by YCA-RE, you can download a very similar texture from here:

 

Los Santos Police Department liveries for 1999 Ford Crown Victoria Police made by YCA-RE.
I've redone the LSPD liveries for this car model and made them resemble more the LAPD markings scheme for the Ford Crown Victoria. These textures still use a low res Los Santos seal as I don't know how to make the model use textures from vehshare.ytd.
This pack only contains the LSPD textures, download the car model from here:
https://www.gta5-mods.com/vehicles/1999-ford-crown-victoria-police
Installation instructions:
1) Download and install the new car model following the instructions provided in the link, or do this: 
 (Use OpenIV to replace "police.yft", "police.ytd", "police_hi.yft" in mods/x64e.rpf/level/gta5/vehicles.rpf) - Don't forget to enable Edit mode.
    or
 (Use OpenIV to replace "police.yft", "police.ytd", "police_hi.yft" in mods/update/x64/dlcpacks/patchday3ng/dlc.rpf/x64/levels/gta5/vehicles.rpf)
2) Open police.ytd then drag and drop all texture files from "LSPD Textures" folder, press Ok when asked (Choose import options window). Save police.ytd and close OpenIV, start the game and you should see the new car textures.