Time To Kickdown (TTK)¶

Description¶

Please refer to the TTM.

Properties¶

Run-time capability¶

Yes

Target values¶

None found

Subject type¶

Optimal for road vehicles (automated and human), sub-optimal for VRUs

Scenario type¶

Overlapping predicted trajectories for a significant time span in the scenario

Inputs¶

Static/dynamic objects and their state (pose, shape, etc.) at time t, MM for maneuver ‘kickdown’

Output scale¶

\(\{-\infty\} \cup [0,\infty]\), time (s), ratio scale

Reliability¶

High, under the assumption that collisions can be reliably predicted

Validity¶

High if used in combination with other criticality metrics, unclear if used exclusively; no sources were found on the validity of examining kickdown maneuvers for threat mitigation

Sensitivity¶

Medium, due to kickdown not always being an actually realizable maneuver, thus high TTK values can be measured in effectively critical scenarios

Specificity¶

Medium, as potentially other feasible threat mitigation maneuvers exist (e.g. braking) even for scenes where TTK \(\leq 0\)