Distance of Closest Encounter (DCE)#
Description#
Please refer to the 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#
\([0,\infty)\), 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