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