The application of real-time distraction monitoring to driver safety systems Matthew R. Smith Gerald J. Witt Debi L. Bakowski January 25, 2007.

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Presentation transcript:

The application of real-time distraction monitoring to driver safety systems Matthew R. Smith Gerald J. Witt Debi L. Bakowski January 25, 2007

2 Distraction Mitigation Advisories Lock-outs Distraction Alerts Trip Report Distraction Monitoring SAVE-IT Program Summary Adaptive Warnings LDW FCW

3 SAVE-IT Safety Warning Countermeasures Evaluated Adaptation Candidates Negative Adaptations Detuning during “attention forward” episodes are designed primarily to improve driver acceptance Positive Adaptations Accentuation during “attention not-forward” episodes are designed primarily to improve safety Note: Safety benefit and driver acceptance are not independent Attention Forward Attention Not-forward Non Adaptive Nominal Warning Redundant Console Nominal Warning Nominal Warning plus console icon Differential Timing Later Alert Earlier Alert Auditory Suppress Alert without auditory stimulus Nominal Alert or Voice stimulus Alert Suppress No Alert Nominal Warning - +

4 Typical Examples of LDW and FCW Nuisance Alerts ` Forward Collision Warning Lane Departure Warning Sloppy turns Lane Change without signal Lane Change / Pass Lead Turning These nuisance alert instances are difficult to avoid without knowing something about the driver’s state

5 SAVE-IT Research: Driving-Simulator Forward Collision Warning Results Crashes / Event Visual+Audio Visual only No Warning FCW Warnings Single exposures / subject in driving simulator

6 SAVE-IT Research: On-road Lane Departure Warning Results  14 drivers drove the adaptive and non- adaptive lane departure system (80 miles with each) Adaptive: no alert when attentive Non-Adaptive: alerts regardless of attention  The adaptive system reduced nuisance alerts by 95 percent (81  4 alerts)  86 percent of subjects preferred the adaptive system  Subjects appeared to be willing to spend significantly more on an adaptive system compared with a non-adaptive system  Subjective ratings showed that drivers did not perceive adaptation as compromising the safety benefit

7  In the context of an experiment, drivers are difficult to surprise and can only be surprised once Developed some effective methods for distracting and surprising drivers Developed efficient single-exposure (between-subject) methodologies for assessing the safety benefit of safety warning countermeasures  In an effort to increase experimental efficiency, it is easy to overwhelm subjects with too much at once in a short space of time Found more consistent results when the subjects time was more focused  Small changes in methodology (such as vehicle speed or time headway) can have apparently large effects on the observed results  The challenge of adaptive systems is to function differently across driver states while preserving the perception of consistent system behavior e.g., suppressing the audio component of an alert when the driver is attentive may confuse the driver or violate the perception of system consistency Differential alert timing (earlier alerts for distracted drivers) appears to best match the driver’s expectations for FCW systems and can negate the effect of distraction  Cognitive distraction operates in a qualitatively different manner than visual distraction and likely requires more sophisticated countermeasures. Lessons Learned in the SAVE-IT Research

8 Research Needs for the Future  Although the short-term SAVE-IT results appear promising for adaptation, we need more long-term on-road exposures to assess the acceptance of adaptive systems.  We need to find repeatable methodologies that allow us to replicate single-exposure imminent-collision warning trials on test tracks, where subjects (falsely) perceive that they are at risk of an imminent collision. To assess safety benefit directly, the worst cases must have virtual collisions (allowing room for a safety benefit) A good example for FCW might be an extension of the cardboard-cutout- vehicle methodology used in the NTHSA/TRC test track evaluation of anti-lock brakes (Mazzae et al., 1999)  We need to develop a set of standardized methodologies that allow us to avoid discrepancies and to directly compare results found at different times, locations, and organizations Given that some small differences can have large effects, we must determine what differences make a difference, and span the problem space accordingly