Change the volume with a hand gesture. Or give a signal to pedestrians with a screen mounted on the car. These, and other Google patents, show how ambitiously the company is reimagining how cars work.

He has built a car that can be driven by hand gestures alone. On a remote controlled car, a Raspberry Pi 2 was installed that handles processing and communication.

Google has filed a patent for technology that would allow drivers to control many functions of a vehicle with hand gestures. Google Cars and trucks are getting closer and closer to being ...