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highway speed

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highway speed [#permalink] New post 24 Mar 2011, 11:08
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

46% (02:37) correct 54% (02:13) wrong based on 56 sessions
[Reveal] Spoiler: OA

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Last edited by vjsharma25 on 25 Mar 2011, 10:36, edited 1 time in total.
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Re: highway speed [#permalink] New post 24 Mar 2011, 11:56
Main argument:
Increasing speed limit will decrease highway safety.

Evidence:
Increasing speed limit will increase average highway speeds.

Assumption which bridges the gap between the evidence and the argument:
Increased highway speeds will decrease highway safety.

To weaken the argument, we need to cast doubt on the assumption.

(A) This is more or less just rephrasing the last portion of the last sentence "almost all drivers who obey current speed limits would likely increase their speed", since it uses the term almost all, it can be assumed that some wont.


(B) Correct, this indicates that a higher average highway speed wont be any more dangerous, and may actually be less dangerous.

(C) This doesn't indicate that they will be any more or less dangerous with the new speed limits.

(D) This is similar to (A) in that it's basically rephrasing "most drivers who currently violate speed limits would obey higher ones" since it uses the term "most", it is implied that some wont.

(E) If anything, this strengthens the argument, since it indicates that the higher speed limits wont cause fast drivers to driver any faster.
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Re: highway speed [#permalink] New post 25 Mar 2011, 06:11
i tend to choose A in this CR.
the E opposed the idea that the highway limits should be increased by saying that if the highway speed would be increased, drivers who violated the posted speed limits would also increase the speed and even the people who have never violated the speed limit would also ruin the speed limits they obeyed >> harm!

we have to weaken that its not harm when we increase the speed limit because the drivers who obey the limit will not increase the speed limit...

B is out of scope for me. Umiformity is never mentioned in the text. and we dont care of it.
i guess this is a LSAT question and i dont like this. its a bit awkward
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Re: highway speed [#permalink] New post 25 Mar 2011, 06:21
The argument does address uniformity.

It says:
(1) That most people who currently speed would not drive faster than they do currently if the speed limit was increased.

And:
(2) People who currently obey speed limits will increase their speed if the speed limit was increased.

If the speed limit is currently 100, then people who obey the speed limit go 100, and people who dont obey it drive ~115.

If the speed limit is raised to 115:
(a) Given (1), the prior speeders will still drive ~115
(b) Given (2), the prior obeyers will now drive closer to 115.

Based on (a) and (b), speeds will be more uniform among vehicles on the highway.
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Re: highway speed [#permalink] New post 25 Mar 2011, 06:38
Also, (A) does not indicate that people will not drive faster.

(1) The argument says that most drivers who currently obey the speed limit will increase their speed
(2) Answer choice (A) says that some drivers who currently obey the speed limit will not increase their speed

Say 98% of drivers who currently obey the speed limit increase their speed when the limits are raised. This would still satisfy both (1) and (2).
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Re: highway speed [#permalink] New post 25 Mar 2011, 07:24
+1 B

Be careful of "most" and "some"; those words are very important.
Split the argument in parts and divide premises and countepremises.
The question is easy; the difficult is in how it was written.
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Re: highway speed [#permalink] New post 25 Mar 2011, 18:15
B....
Re: highway speed   [#permalink] 25 Mar 2011, 18:15
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