Thank you for your reply Parks. I will be sitting down with the other devs to see what script we're using to control the sirens and lights on the server for our non-ELS vehicles. I have a suspicion that it might be because it doesn't have FLAG_EMERGENCY_SERVICES in the vehicles.meta which I did notice that Rylan Givens' Defender boat has on its vehicles.meta. I'll definitely be checking in again here if I find a solution in case you wish to add it to the docs found in the FiveM repository. I also checked the link for the vehicle templates in the modding guide and can confirm that it now works as intended. Again, thank you very much for your reply and keep up the good work!