WASHINGTON – A study by the National Highway Traffic Safety Administration suggests that antilock braking systems on air-brake tractor-trailers reduces crashes by about 3 percent.
The study, titled "The Effectiveness of ABS in Heavy Truck Tractors and Trailers," reviews about 10-years worth of data from seven states following the introduction of the Federal Motor Vehicle Safety Standard mandating ABS.
The study notes, however, that data was insufficient to determine the effectiveness of ABS on the trailer or whether it is beneficial for only the trailer to have ABS when the tractor does not.
As well, the study found that among the types of crashes that ABS affects, there is a reduction in jackknives, off-road overturns, and at-fault involvement in collisions with other vehicles, with the exception front-to-rear collisions.
Counteracting are an increase in the number of involvements of hitting animals, pedestrians, or bicycles, and, only in fatal crashes, rear-ending lead vehicles in two-vehicle crashes.
The study also notes that the rate may be underestimated due to several factors, including an unknown proportion of tractors that voluntarily had ABS equipped before the mandate and the unknown number of ABD systems involved in a crash that may not have had the ABS system working properly at the time.
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