Robots may one day fully replace police officers. In the meantime, they can be used to keep them and motorists safer. Take this Traffic Stop Robot from SRI for instance: it is designed to make traffic stops safe for both sides. The robot goes between people to reduce the chances of dangerous interactions.
The robot is deployed via a spike arm in front of the rear tires. The police officer will be able to interact with the drivers through a tablet installed on the robot.