On the 12th line down change your <audioNameHash />
Right now, you're using the default audio files for that vehicle. So police4 is using the audio files for police 4. but what you want it to be using are the default audio files for vehicles that have ELS like police, police2 and police3.
So change your audio hash lines to: <audioNameHash> police2 <audioNameHash /> or <audioNameHash> police3 <audioNameHash />
Let me know if that solves your issue