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Effects of an In-Vehicle Collision Avoidance Warning System on Short

and Long-Term Driving Performance

Presented by: Josh Essner & Scott LubenskyPresented by: Josh Essner & Scott Lubensky

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•PURPOSEPURPOSE Study the effects of an imperfect in-vehicle collision

avoidance warning system (IVCAWS) both on driver headway maintenance and on driver behavior in response to warning system errors

Four hypothesis Drivers have poor sense of safe headway and

tend to drive too close IVCAWS will help driver maintain proper headway This learning process will be retained long after The more reliable the system, the better the driver’s

performance

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•PREVIOUS RESEARCHPREVIOUS RESEARCH

30% of all car crashes on public roads were rear end collisions

Study shows that people tend to overestimate headway regardless of number of years of driving experience

Believe sudden braking on highway won’t happen Believe if they match speed they won’t collide Reinforcement from past experience

“looking but not seeing”

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•WHY IMPORTANTWHY IMPORTANT

Two human factors issues

Interface to use in relaying information from automatic system to driver

Auditory tone found to be most effective

How to analyze interaction between system and driver when both are capable of error

Combination of both system performance and driver’s subsequent behavior

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•CONTRIBUTIONCONTRIBUTION

Help in training new drivers correct headway distance

Allow for a means of alerting drivers to situations they may not be aware of

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•METHODMETHOD

30 participants – 15 male, 15 female 5 or more years of driving experience Grouped into 3 experimental groups based on

reliability of system

1997 Hyundai Accent with laser based headway detection device

4 trials for each participant

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•ANALYSISANALYSIS Two way ANOVA between trial number and temporal

headway category Significant with p < 0.0001

Individual ANOVA tests between first trial and remaining 3

All significant with p < 0.0001

No significant effect of reliability of system or driver speed on headway maintenance

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•RESULTSRESULTS

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•RESULTSRESULTS

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•RESULTSRESULTS

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•RESULTSRESULTS

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•CONCLUSIONSCONCLUSIONS

Drivers are generally poor at estimating temporal headway

Can be improved with use of IVCAWS

IVCAWS taught drivers to correctly assess temporal headway both immediately after use and six months later

Reliability of system had no effect on usefulness

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•FURTHER WORKFURTHER WORK

Effects of IVCAWS on habitual behavior People choose on own free will to adjust their own

headways

Sensor on rear of car to help communication between drivers

Intelligent cruise control

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•QUESTIONSQUESTIONS

Do you think that this system will help habitual driving habits?