intelligent speed adaptation (ISA) or Speed Alerting
To promote the technology, the European New Car Assessment Programme (Euro NCAP) counts ISA systems as one of the safety features automakers can use to qualify vehicles for Euro NCAP Advanced. Models that have earned the designation so far haven’t been fitted with an ISA (go to www.euroncap.com/rewards.aspx). In the
Although ISA systems haven’t been deployed on a large scale on private vehicles in the United States or Europe, the devices have been studied for more than 20 years. Several studies, including two recently published ones, point to potential benefits.Warnings and financial incentives In field studies, advisory ISA systems are sometimes coupled with economic incentives to not speed. Researchers who conducted the first naturalistic driving study of ISAs in the U.S. concluded that drivers who received modest cash incentives for not speeding
The study by researchers at NHTSA, Old Dominion University and Western Michigan University involved 50 drivers ages 24-39 with at least five years of driving experience. Participants drove study-provided vehicles fitted with an ISA for four weeks. Forty drivers received speed alerts. A subset of these were paid as much as $25 to drive within 4 mph of the speed limit in weeks 2-3. They lost money if they sped. A control group of 10 drivers didn’t get alerts or cash.Drivers in the incentive group reduced the percentage of time they drove 9 mph or more over the limit to less than 1 percent, compared with about 5 percent in the baseline period. Drivers in the control and warning-only groups traveled 9 mph or more over the speed limit as much as 9 percent of the time.“The findings have implications for the use of intelligent speed adaptation systems in conjunction with insurancepremiums to significantly improve traffic safety,” the authors conclude.
In Denmark, researchers from Aalborg University and Copenhagen University evaluated an ISA combining speed advisories with insurance discounts and found that linking an ISA to incentives can reduce speeding. The greatest reductions were on roads with 80 kph (50 mph) limits. The calculated proportion of distance above the speed limit dropped from 13 percent in the baseline period to just below 4 percent in the study period. When drivers turned off the system, speeding relapsed to the baseline level. The 2007-09 field trial included 153 drivers ages 18-81
who drove their own vehicles fitted with an ISA
A 2009 Institute study found that equipping the cars teens drive with monitoring devices that provide
real-time feedback can reduce their risks behind the wheel (see Status Report, May 7, 2009, at iihs.org).
“The effects of external motivation and real-time automated feedback on speeding behavior in a naturalistic setting” by I.J. Reagan et al. appears in the May 31, 2012, online issue of Human Factors: The Journal of the Human Factors and Ergonomics Society.
“Pay as you speed, ISA with incentives for not speeding: results and interpretation of speed data” by H. Lahrmann et al. is in the September 2012 issue of Accident Analysis and Prevention.
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