A driving-rule system suitable to operate an automated includes a vehicle-detector and a controller. The vehicle-detector is suitable for use on a host-vehicle. The vehicle-detector is used to detect movement of an other-vehicle proximate to the host-vehicle. The controller is in communication with the vehicle-detector. The controller is configured to operate the host-vehicle in accordance with a driving-rule, detect an observed-deviation of the driving-rule by the other-vehicle, and modify the driving-rule based on the observed-deviation.
