Headquartered in Detroit, Michigan, General Motors designs, manufactures, markets, and distributes vehicles and vehicle parts. GM has been making strides towards their journey within the autonomous vehicle space. In 2016, General Motors bought Cruise Automation, a San Francisco self-driving vehicle start-up that uses sensors, machine learning, and cloud-based tools to develop self -driving cars. In 2017, GM acquired Strobe, a solid state LIDAR company which uses brief "chirps" of frequency-modulated laser light. Measuring the phase and frequency of the echoing chirp allows the system to directly measure both the distance and the velocity of objects in the road ahead. Strobe, Cruise and GM will work together to develop the technology for future self-driving cars.