Examining the impact of ASE (automated speed enforcement) in work zones on driver attention : final report.
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2016-01-01
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Abstract:Each year, there are over 500 fatal crashes in work zones in the U.S., with over 100 road construction workers
killed on work sites (NSC, 2011; FARS, 2011). Speed and distraction are among the top contributing factors to
work zone crashes (Garber & Zhao, 2002; Mountain, Hirst, & Maher, 2005; Wilson, Willis, Hendrikz, Le Brocque,
& Bellamy, 2006). The purpose of this study was to investigate the impact of different types of speed enforcement
methods on driver attention in work zones. The investigation not only examined enforcement methods currently
used in Minnesota, but also examined how implementing automated speed enforcement (ASE), which is not
currently used in Minnesota, may influence driver attention and behavior in simulated work zones. Overall, the
results do not appear to support the hypothesis that ASE without dynamic speed display sign (DSDS) improves
driver attention in work zones. There is some evidence, however, that drivers did heighten their visual attention in
work zones with ASE+DSDS enforcement. Drivers fixated on the secondary task display less frequently in the
ASE+DSDS condition compared to other enforcement types while they traveled in the downstream portion of the
work zone. The largest effects of the study were found among the age groups, with younger and older drivers
exceeding the speed limit most often and varying their speed slightly depending on the type of enforcement
present. Middle-aged drivers exhibited the greatest speed control and tended to abide by the speed limit to the same
extent regardless of the type of enforcement present.
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