United States Department of Transportation
i
Safety impact of an integrated crash warning system based on field test data.
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2011-06-13
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[PDF-415.29 KB]
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Abstract:This paper provides the results of an analysis
conducted to assess the safety impact of an integrated
vehicle-based crash warning system based on
naturalistic driving data collected from a field
operational test. The system incorporates four
functions that warn the driver of an imminent rear end
crash, excessive speed to an upcoming curve,
lane-change crash, or unintentional lane departure.
The safety impact is assessed in terms of observed
changes in driving behavior, exposure to driving
conflicts, near-crash experience, and projected
potential reductions in the number of annual target
crashes. Unintended consequences are examined by
analyzing driver engagement in secondary tasks and
eyes-off-the-forward-scene behavior. A total of 108
subjects, split by gender and three age groups,
participated in the field test by driving in an
unrestricted manner for a period of six weeks each.
In the first two weeks, designated as the baseline
period, the subjects performed their naturalistic
driving with the system turned off while the data
acquisition system collected their performance data.
In the last four weeks, designated as the treatment
period, the system was turned on and provided the
subjects with visual, auditory, and haptic crash
warning signals. This paper discusses the safety impact
of the system for individual subject groups based on
gender and age. The integrated system has the
potential to reduce the number of rear-end, opposite direction,
lane-change, and road-departure crashes
involving at least one passenger car. Moreover, the
system did not influence drivers to engage in more
secondary tasks.
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