Time To Steer (TTS) =================== Description ----------- Please refer to the :doc:`TTM`. Properties ---------- Run-time capability ~~~~~~~~~~~~~~~~~~~ Yes Target values ~~~~~~~~~~~~~ 0.47 s [Junietz2018a]_ (threshold for critical), 1 s [Huber2020]_ (ADF testing) 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 'steer' Output scale ~~~~~~~~~~~~ :math:`\{-\infty\} \cup [0,\infty]`, time (s), ratio scale Reliability ~~~~~~~~~~~ High, under the assumption that collisions can be reliably predicted Validity ~~~~~~~~ High for two-actor scenes, medium for more actors when TTS is evaluated under a fixed perspective, but can be increased by aggregating over all actors as at least for one of them, the TTS will be valid Sensitivity ~~~~~~~~~~~ High for non-humans, as steering is often optimal for threat mitigation than braking [Adams1994]_; medium for humans as steering maneuvers are seldomly preferred [Adams1994]_ Specificity ~~~~~~~~~~~ High under the assumption that the DMM has a low ratio of spurious collision among all predicted collision Prediction model ~~~~~~~~~~~~~~~~ Time window ^^^^^^^^^^^ unbound, but usefulness depends on DMM Time mode ^^^^^^^^^ linear time