1. A method for causing safe or robust travel of an autonomous vehicle, the method comprising receiving signals from a sensor of the autonomous vehicle, the signals representing a sensed aspect of an environment in which the autonomous vehicle is to travel, by computer determining an ability of the autonomous vehicle to safely or robustly travel a road feature or a road segment or a route that is being considered for the travel of the autonomous vehicle as of a time or range of times, the road feature or road segment or route conforming to properties of stored road network information eliminating the road feature or road segment or route from consideration if the computer has determined that the road feature or road segment or route cannot be safely or robustly traveled by the autonomous vehicle, the determining of the ability of the autonomous vehicle to safely or robustly travel the road feature or road segment or route being based on properties of the environment in which the autonomous vehicle travels, the determining of the ability of the autonomous vehicle to safely or robustly travel the road feature or road segment or route based on an actual or estimated level of performance of the sensor with respect to the properties of the environment, and sending signals to cause the autonomous vehicle to travel and to avoid the road feature or road segment or route while traveling.