Driverless Cars Need Ears as Well as Eyes

WIRED 

Hearing plays an essential role in how you navigate the world, and, so far, most autonomous cars can't hear. It recently spent a day testing the system with emergency vehicles from the Chandler, Arizona, police and fire departments. Police cars, ambulances, fire trucks, and even unmarked cop cars chased, passed, and led the Waymo vans through the day and into the night. Sensors aboard the vans recorded vast quantities of data that will help create a database of all the sounds emergency vehicles make, so in the future, Waymo's driverless cars will know how to respond.