The policesirensbyfenderrocker34.zip file you have requested: Modifications / Police Siren Sounds - 337.85kb is not available. Perhaps try browsing all files for the game Grand Theft Auto: San Andreas and upload any files you want to share or are missing. This is the only information we could locate:
Here are some new police sounds, these sounds will replace the Police, Ambulance, Fire Engine sounds within GTA San Andreas. These sounds sound more realistic that the ones already in GTA San Andreas. As for installing I would suggest that you read the readme before trying to install the mod.