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 \(\leq 0\)