OfficerK

I'm not sure if this has been requested before if it was i apologize, But i searched and didn't find anything on this topic.
 
But i think in a new release of LCPDFR if there is going to be a new release, You should add 2 Kinds of roadblock 1 is a regular roadblock without spikestrips, The other 1 is a roadblock with a spikestrip. Also maybe make like car compatibilities so like you can get ahead the criminal's car, then press a button and the car will drive over them and their tires will get poped and probably spin out of control making him easy to arrest!

you can us this and change the skin 

Sorry, I could have sworn that I replied to this.
 
Anyway, if you're getting the invalid resource message, I suggest that you try a different car model and ensure that you are installing it correctly. If you still can't get it to work, reinstalling should not be needed, just a reinstall of vehicles.img. You can find the backup of it here:
http://www.gta-downloads.com/en/gta4/file-backups/10674-models-cdimages-folder-backup.html
(ensure that you download gtaivbackups_14_pc_mo...cdimages_vehicles.rar)
 
It goes in Rockstar GamesGrand Theft Auto IVpcmodelscdimages. This will reset all of your vehicles to the original ones and therefore remove any corrupted or bad models, allowing you to try again without having to reinstall the whole game. Again, try to just put in another car before you put in the whole new img.

Open IV and Spark IV are the same thing technically. I personally like OpenIV because you can just drag the cars in, and OpenIV auto saves them. Also You can view the car model in a 3D view. 

I dont know if this is the right section and apoligize if not  But i have a question,
Do I need to have EMS Lighting System for all modded cars to work with sirens or do some already have sirens working without EMS?
I got a modded car pack before and the lights weren't working So i didnt know but please post best answers because i just stick with regular cars, please help.