Logical ReasoningDifficulty: Medium

PT21 S3 Q9 Explanation

If Eva responded to Luis by saying

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

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Stimulus

Eva: A “smart highway” system should be installed, one that would monitor areawide traffic patterns and communicate with computers in vehicles or with programmable highway signs to give drivers information about traffic congestion and alternate routes. Such a system, we can infer, would result in improved traffic flow in and around cities considerable loss of money and productivity that now results from traffic congestion.

Louis: There are already traffic reports on the radio. Why would a “smart any better?

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

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

The question
9.

If Eva responded to Luis by saying that the current one-minute radio reports are too short to give a sufficient description of overall patterns of traffic congestion, which

Answer choices

  1. No Impact20% picked this

    Bad weather, which radio stations report, would cause traffic to slow down whether or not a “smart highway”

    This doesn't have anything to do with whether a smart highway can do any better at conveying more than 1-minute's worth of information about patterns of traffic congestion. This answer basically just says, "Rain can cause traffic to slow down".

  2. Correct70% picked this

    It would be less costly to have radio stations that give continual, lengthier traffic reports than to install

    Why this is right

    This is kind of a weird rebuttal from Louis, because it's not saying the status quo of radio traffic reports is better than smart highways would be, but it's saying that "a smart highway" is not a better way to deliver this traffic information than "traffic reports on the radio" are, because we could tweak radio traffic reports to accomplish the thing that Eva cares about. We could deliver all this traffic awareness content that Eva desires for less money if we just made a dedicated radio station (like The Weather Channel on cable TV).

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

  3. Opposite8% picked this

    Radio reports can take note of congestion once it occurs, but a “smart highway” system could anticipate and

    Since this is pointing out a way in which the smart highway would be superior to traffic reports on the radio, it's the opposite of what we want.

  4. No Impact0% picked this

    The proposed traffic monitoring would not reduce the privacy

    If the smart highway did reduce the privacy of others, that would be a bad thing that would help Louis argue that delivering traffic updates via radio is superior. By ruling out that idea, we might be marginally strengthening Eva's plan. No matter what, we're not helping Louis argue for the superiority of radio.

  5. Opposite1% picked this

    Toll collection booths, which constitute traffic bottlenecks, would largely be replaced in the “smart highway” system by electronic debiting of commuters’ accounts

    Since this is pointing out a way in which the smart highway would be beneficial to traffic flow, it's the opposite of what we want. (We want to help Louis defend the idea that we don't need a smart highway system; delivering traffic reports on the radio is at least as good)

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