Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on May 8, 2009
Boston police responding.
Ford Crown Victoria P71 with Federal Signal SS2000 siren with Rumbler.
The low-pitched siren you hear is called a "rumbler", which emits low frequencies so you can actually feel the siren's vibrations as it approaches, from up to 300 feet away. This is effective for clearing past people with their radios up, or those that are hard of hearing.