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Truck CR-GMAT PREP

Expert replies
by selango » Sun Jul 18, 2010 9:27 am
In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities. 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 highway deaths would be to require shippers to increase their use of triple-trailer trucks.

Which of the following, if true, most seriously weakens the argument?

A. Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only.

B. No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks.

C. Very few fatal collisions involving trucks in Partoria are collisions between two trucks.

D. In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.

E. In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks.

OA later..Explain ur reasons.
--Anand--
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Source: — Critical Reasoning |

by grockit_andrea » Sun Jul 18, 2010 9:48 am
The conclusion here, that Partoria can reduce highway deaths by requiring shippers to increase their use of triple-trailer trucks, depends on the evidence that triple-trailer trucks had less than a third of the accident rate of single- and double-trailer trucks. The assumption is that the lower accident rate of the triple-trailer trucks is a result of the trucks themselves somehow being safer. However, there are some variables that the author fails to take into account; for example, the people driving the triple-trailer trucks may be more experienced than other drivers, or the routes that are trafficked by the triple-trailer trucks may be safer. If it turns out that something besides the trucks themselves is responsible for the lower accident rate, the conclusion is weakened. Choice A provides that: if triple-trailer trucks have so far only been used on lightly traveled sections of major highways, then maybe it's the routes, not the trucks themselves, that account for the lower accident rate. In that case, using more triple-trailer trucks won't necessarily reduce the number of deaths, because if they are used on more highly traveled roads, the accident rate could increase.
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by arora007 » Sun Jul 18, 2010 7:57 pm
IMO-A

in weakening questions you have to go from the answer choices to the question stem.
just thought... which choice could explain the less number of accidents in 3 trailer trucks...
triple trailer is used in A and E only...and E seems to be out...somehow...
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by sk818020 » Sun Jul 18, 2010 7:58 pm
As you do more CR questions you'll notice this same sort of reasoning. The argument says that because triple trailers tend to be proportionally in less accidents, that all trailers should have to travel this way. The argument assumes that triple trailers travel in similar conditions as other trailers. To weaken the argument you only need to show that they don't.

A. should make the most sense. If triple trailers travel only on lightly used roads, then the reason they in fewer accident's isnt because they are triple trailer, but instead because they travel on highways with less drivers.

Hope this helps.

Thanks,

Jared
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by selango » Mon Aug 02, 2010 1:01 am
OA A
--Anand--
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