Logical ReasoningDifficulty: Easy

PT118 S1 Q15 Explanation

At the request of Grove

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsFlaw

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Stimulus

At the request of Grove Park residents, speed bumps were installed on all streets in their neighborhood. However, although through traffic does cause noise and congestion in Grove Park, this remedy is blatantly unfair. The neighborhood is not a private community, and its streets were have the right to use them whenever they please.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
15.

The reasoning in the argument is most vulnerable to criticism on the

Answer choices

  1. Not an Objection2% picked this

    ignores the possibility that speed bumps may not reduce the speeds at which drivers drive

    If we interpreted this answer as saying, "Hey, author, anyone can still use the road. You don't have to slow down as you drive through the neighborhood", it would have some pushback, but its force is very weak. And the answer isn't pointing out the logical disconnect between "free to use the road" and "speed bumps". It's just saying speed bumps might not reduce driver speed. That might even be interpreted as HELPING the author. "These speed bumps are unfair AND they're not even going to accomplish their goal!"

  2. Not a Reasoning Critique8% picked this

    neglects the possibility that drivers frequently drive through the neighborhood at

    This sounds like it's an argument in favor of installing speed bumps, so it's pushing back against our author who thinks that speed bumps are unfair. But this isn't addressing the author's reasoning at all. It doesn't address the issue of whether speed bumps lead to a public road being inaccessible to any drivers.

  3. Not Necessary2% picked this

    provides no evidence that drivers have complained about the new speed bumps

    In order to prove that something is unfair, you don't need to demonstrate that anyone has complained about it being unfair. People might accept unfair treatment stoically and silently. Their lack of protest wouldn't show an absence of wrongdoing.

  4. Opposite6% picked this

    contains the tacit assumption that residents of neighborhoods should have the right to restrict traffic

    This author is saying that a traffic restriction prompted by residents of this neighborhood is unfair. So it doesn't feel like she's tacitly endorsing the idea of resident-sponsored traffic restrictions.

  5. Correct83% picked this

    presumes, without providing justification, that speed bumps do prevent drivers from using the roads on which

    Why this is right

    Yes, this gets to the Irrelevant Response. What does "speed bumps" have to do with "we all have the right to use these roads"? The author is assuming that speed bumps somehow impinge on people ability to use the roads.

    Skill tested: Flaw · how this choice captures the argument's function is the move to repeat next time.

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