US Patent 9364178 Robotic vehicle control

A vehicle includes a detection system, configured to acquire data regarding operation of the vehicle, and a robotic driving device, configured to provide robotic control of the vehicle. The vehicle also includes a control system configured to determine whether the robotic driving device is activated, such that the vehicle is in robotic driving mode; receive a request by a prospective operator of the vehicle to deactivate the robotic driving device to initiate a manual driving mode; determine whether the prospective operator is impaired based on the data; and selectively grant or refuse the request based on the determination.