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Criticality Metrics
Criticality Metrics

Time-Scale Criticality Metrics

  • Encroachment Time (ET)
  • Post Encroachment Time (PET)
  • PTTC (Potential Time To Collision)
  • Predictive Encroachment Time (PrET)
  • Time Exposed TTC (TET)
  • Time Headway (THW)
  • Time Integrated TTC (TIT)
  • Time To Brake (TTB)
  • Time To Collision (TTC)
  • Time To Closest Encounter (TTCE)
  • Time To Kickdown (TTK)
  • Time To Maneuver (TTM)
  • Time To React (TTR)
  • Time To Steer (TTS)
  • Time To Zebra (TTZ)
  • Worst Time To Collision (WTTC)

Distance-Scale Criticality Metrics

  • Accepted Gap Size (AGS)
  • Distance of Closest Encounter (DCE)
  • Headway (HW)
  • Proportion of Stopping Distance (PSD)

Velocity-Scale Criticality Metrics

  • Conflict Severity (CS)
  • Delta-v (\(\Delta v\))

Acceleration-Scale Criticality Metrics

  • Deceleration to Safety Time (DST)
  • Required Lateral Acceleration (\({a}_{\mathit{lat,req}}\))
  • Required Longitudinal Acceleration (\({a}_{\mathit{long,req}}\))
  • Required Acceleration (\({a}_{\mathit{req}}\))

Jerk-Scale Criticality Metrics

  • Lateral Jerk (LatJ)
  • Longitudinal Jerk (LongJ)

Index-Scale Criticality Metrics

  • Aggregated Crash Index (ACI)
  • Accident Metric (AM)
  • Brake Threat Number (BTN)
  • Conflict Index (CI)
  • Crash Potential Index (CPI)
  • Pedestrian Risk Index (PRI)
  • Responsibility Sensitive Safety Dangerous Situation (RSS-DS)
  • Space Occupancy Index (SOI)
  • Steer Threat Number (STN)
  • Trajectory Criticality Index (TCI)

Probability-Scale Criticality Metrics

  • Collision Probability via Monte Carlo (P-MC)
  • Collision Probability via Scoring Multiple Hypotheses (P-SMH)
  • Collision Probability via Stochastic Reachable Sets (P-SRS)

Potential-Scale Criticality Metrics

  • Potential Functions as Superposition of Scoring Functions (PF)
  • Safety Potential (SP)

References

  • References
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