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Intersection AEB implementation strategies for left turn across path crashes.

Ulrich Sander1, Nils Lubbe2, Sylvia Pietzsch3

  • 1a Veoneer Sweden AB, Research , Vårgårda , Sweden.

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|August 6, 2019
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Summary
This summary is machine-generated.

Equipping both turning and straight-heading vehicles with intersection automated emergency braking (AEB) significantly improves crash avoidance and injury mitigation for left turn across path (LTAP) scenarios. Dual-vehicle AEB systems offer greater protection than single-vehicle systems.

Keywords:
AEBLeft turn across pathcrash avoidanceinjury mitigationintersection

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Area of Science:

  • Traffic Safety Engineering
  • Automotive Safety Systems
  • Accidentology

Background:

  • Left turn across path with traffic from the opposite direction (LTAP/OD) is a frequent and severe car-to-car intersection crash type.
  • Intersection automated emergency braking (AEB) systems offer a potential solution for mitigating these crashes.

Purpose of the Study:

  • To investigate two implementation strategies for intersection AEB targeting LTAP/OD crashes.
  • To evaluate the influence of a safety zone on AEB effectiveness in accident avoidance, injury mitigation, and delta-V.
  • To analyze AEB performance as a function of market penetration.

Main Methods:

  • Resimulation of 372 LTAP/OD crashes from the German In-Depth Accident Study (GIDAS) using the PRAEDICO simulation framework.
  • Application of a rigid-body impact model and GIDAS-derived injury risk curves to predict injuries (MAIS 2+F).
  • Evaluation of two AEB strategies: turning vehicle only vs. both turning and straight-heading vehicles, with and without a safety zone.

Main Results:

  • At 100% market penetration and with a 0.2m safety zone, equipping only the turning vehicle with AEB avoided 59% of crashes; equipping both vehicles avoided 77%.
  • Injury reductions for MAIS 2+F were 60% for the single-vehicle strategy and 76% for the dual-vehicle strategy.
  • Delta-V decreased significantly with market penetration for left-side impacts in the dual-vehicle strategy, but less so for frontal/right-side impacts. Eliminating the safety zone reduced effectiveness.

Conclusions:

  • Intersection AEB implementation strategy and safety zone definition critically impact real-world performance.
  • Equipping both turning and straight-going vehicles with AEB is essential to maximize LTAP/OD crash mitigation potential.
  • Further research on situationally appropriate safety zones and continuous in-crash protection development is needed due to limited delta-V reduction.