Distance of Closest Encounter (DCE) =================================== Description ----------- Please refer to the :doc:`TTCE`. Properties ---------- Run-time capability ~~~~~~~~~~~~~~~~~~~ Yes Target values ~~~~~~~~~~~~~ None found Subject type ~~~~~~~~~~~~ Road vehicles (automated and human) Scenario type ~~~~~~~~~~~~~ Any scenario Inputs ~~~~~~ Static/dynamic objects and their state (pose, shape, etc.) at time t Output scale ~~~~~~~~~~~~ :math:`[0,\infty)`, distance (m), ratio scale Reliability ~~~~~~~~~~~ Medium, often, changes in criticality will not be reflected in a change in spatial proximity, e.g. reductions of velocity Validity ~~~~~~~~ Medium, as the interpretation of the spatial proximity depends on other factors such as angles, velocities, and relative positioning; no empirical analysis available Sensitivity ~~~~~~~~~~~ High, as many critical scenes exhibit a spatially close encounter Specificity ~~~~~~~~~~~ Low, as a not all close encounters, specifically in unstructured or urban settings at low velocities, are directly critical Prediction model ~~~~~~~~~~~~~~~~ Time window ^^^^^^^^^^^ Unbound, but usefulness depends on DMM Time mode ^^^^^^^^^ Linear time