The Los Angeles Police Department is adding new technology to its black-and-white patrol vehicle fleet, including upgraded sirens designed to alert drivers sooner and improve safety.
The so-called Rumbler low-frequency warning system works alongside existing sirens to produce low-frequency sound waves that motorists and pedestrians can both hear and feel.
Unlike conventional sirens, police say the low-frequency tones can penetrate sound-insulated vehicles, giving drivers more time to react to approaching emergency vehicles.
At the same time, the LAPD is installing the Federal Signal Sync Module, a system that allows multiple patrol vehicles to simultaneously broadcast synchronized prerecorded public safety announcements during evacuations and major operations…