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1000 CR - Speed Limit

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by nilanjan.manna » Sat Apr 17, 2010 11:32 pm
Reducing speed limits neither saves lives nor protects the environment. This is
because the more slowly a car is driven, the more time it spends on the road spewing exhaust into the air and running the risk of colliding with other vehicles.

The argument's reasoning is flawed because the argument

(A) neglects the fact that some motorists completely ignore speed limits.
(B) Ignore the possibility of benefits from lowering speed limits other than environmental and safety benefits.
(C) Fails to consider that if speed limits are reduced, increased driving times will increase the number of cars on the road at any given time.
(D) Presumes, without providing justification, that total emissions for a given automobile trip are determined primarily by the amount of time the trip takes
(E) Presumes, without providing justification, that drivers run a significant risk of collision only if they spend a lot of time on the road.
[spoiler]
OA D
why E is incorrect?[/spoiler]
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Source: — Critical Reasoning |

by T11 » Sun Apr 18, 2010 12:09 am
Hi,
why E is incorrect?
E is a contender but it has a few flaws:

1) E says that "Drivers run a significant risk" whereas the stimulus speaks about lives in general (passengers, pedestrians etc).
2) E also is too strong because it says "only if they spend a lot of time on the road". It does not have to be the only risk, it can be one of the risks.

T
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by Shawshank » Sun Apr 18, 2010 12:21 am
nilanjan.manna wrote:Reducing speed limits neither saves lives nor protects the environment. This is
because the more slowly a car is driven, the more time it spends on the road spewing exhaust into the air and running the risk of colliding with other vehicles.

The argument's reasoning is flawed because the argument

(A) neglects the fact that some motorists completely ignore speed limits.
(B) Ignore the possibility of benefits from lowering speed limits other than environmental and safety benefits.
(C) Fails to consider that if speed limits are reduced, increased driving times will increase the number of cars on the road at any given time.
(D) Presumes, without providing justification, that total emissions for a given automobile trip are determined primarily by the amount of time the trip takes
(E) Presumes, without providing justification, that drivers run a significant risk of collision only if they spend a lot of time on the road.
[spoiler]
OA D
why E is incorrect?[/spoiler]
Its mentioned that the number of collisions will increase by the smoke that is emitted from vehicles... Not by the time spent by drivers on the road.. Hence E is incorrect.

IMO -- D
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by T11 » Sun Apr 18, 2010 7:22 am
Hi Shawshank,
Its mentioned that the number of collisions will increase by the smoke that is emitted from vehicles... Not by the time spent by drivers on the road.. Hence E is incorrect.

The more slowly a car is driven - the more time it spends on the road (doing two independant things)
1) spewing exhaust into the air and
2) running the risk of colliding with other vehicles

I'm not sure if the interpretation that 'collisions will increase by the smoke that is emitted from vehicles' is right.

T
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by grockit_andrea » Sun Apr 18, 2010 12:28 pm
E uses the unclear term "a lot of time on the road." Without knowing what constitutes "a lot of time," relative to the amount of time spent on the road by drivers obeying reduced speed limits, we can't weigh the value of an idea about "a lot of time." The same is true of the word "significant," since again, we don't have any way of knowing what would be significant. And, of course, as was already mentioned, the word "only" is too strong.
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