What are all of the things I see on the roof of your self-driving test vehicles?

The thing on the roof of our self-driving test vehicles is called a “sensor pod.” It houses many of our vehicles’ sensors. Each sensor — lidar, radar, and camera — enable our vehicles to see and sense the world around them. We use three types of sensors for greater redundancy, to ensure our vehicles are accurately “seeing” the world, and doing so in all kinds of weather and lighting conditions.