Abstract: Methods and systems for controlling the parking brakes of a vehicle are provided. The system comprises a first brake unit; a second brake unit; a third brake unit; a fourth brake unit; a first controller powered by a first power source; a second controller powered by a second power source and communicatively coupled to the first controller via a first and second communication link; and a third controller powered by the first power source and communicatively coupled to the first controller via a third communication link and to the second controller via a fourth communication link, wherein the second controller, based at least in part on a signal received from the first controller, operates the first brake unit and the fourth brake unit, and the third controller, based at least in part on the signal received from the first controller, operates the second brake unit and the third brake unit.

Abstract: Drivable vehicles, such as electric go-karts, for driving in a controlled environment are equipped with a camera, a display, and a processor for controlling images on the display. In one embodiment, the camera and display are in a single smartphone, with the camera lens facing opposite to the display. The smartphone is affixed to a safety helmet, or other headgear, so that the driver can simultaneously view the display screen while seeing the real world using peripheral vision. Overlaid on the displayed real world image is any type of artificial reality image, such as obstacles, robot combatants, simulated vehicles, etc. The AR image may be independently controlled by the smartphone processor and interacts with the driver, such as by reacting to getting shot by the driver or shooting at the driver. The AR image is 3-D rendered so its perspective and size realistically changes as the vehicle is driven.