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