In the nation of Partoria, large trucks currently have a much higher rate of traffic accidents per mile driven than other vehicles do. However, the very largest trucks—those with three trailers—had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce the number of traffic accidents would be to require shippers to increase their use of triple-trailer trucks.
Which of the following, if true, most seriously weakens the argument?
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APartorian trucking companies currently use triple-trailer trucks only for long trips using major highways, which is the safest kind of trip for large trucks.
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BNo matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks.
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CIncreased use of triple-trailer trucks would mean that large trucks would account for a smaller proportion of all miles driven on Partoria's roads than they currently do.
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DIn Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.
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EThe volume of truck traffic on Partoria's highways could be reduced by encouraging shippers to use rail transport whenever possible.
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