1. A computer-implemented method comprising by computer determining an ability of an autonomous vehicle to safely or robustly travel a road feature or a road segment or a route that is being considered for the autonomous vehicle as of a time or range of times, the route conforming to properties of stored road network information and 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 determination by the computer being based on properties of the environment in which the autonomous vehicle travels.