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# On most side streets in the United States, the speed limit

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Manager
Joined: 04 Aug 2013
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On most side streets in the United States, the speed limit  [#permalink]

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11 Jul 2014, 06:15
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Difficulty:

95% (hard)

Question Stats:

25% (02:36) correct 75% (02:41) wrong based on 570 sessions

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On most side streets in the United States, the speed limit is 25 miles per hour unless otherwise posted. Traffic studies demonstrate that automobile drivers will go faster on side streets for which a speed limit of 25 miles per hour is posted than drivers will go on side streets for which no speed limit signs are posted. Psychologists believe that this is the case because simply seeing a speed limit sign makes drivers go faster because they feel less personally responsible for operating their vehicles at speeds appropriate to the conditions of the road.

Which of the following, if true, would most strengthen the psychologists' explanation of the above mentioned studies?

A The studies included both younger and older drivers, ranging from 16 to 89 years of age.

B Drivers who feel personally responsible for operating their vehicles at speeds appropriate to the conditions of the road tend to drive faster when no pedestrians are present than they do when pedestrians are present.

C In the vast majority of the cases in the traffic studies, those who drove slower did not feel personally responsible for operating their vehicles at speeds appropriate to the conditions of the road.

D For the most part, drivers who feel personally responsible for operating their vehicles at speeds appropriate to the conditions of the road drive slower than those who do not feel personally responsible for operating their vehicles at speeds appropriate to the conditions of the road.

E Generally, drivers will go faster on roads with higher posted speed limits than they will on roads with lower posted speed limits.
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Re: On most side streets in the United States, the speed limit  [#permalink]

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13 Jul 2014, 12:56
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D merely restates the observation that drivers who feel personally responsible drive slower .

B actually demonstrates this : B demonstrates that the drivers who feel responsible will change their behavior according to the road conditions. i.e their driving speeds depending the presence of the pedestrians.

So i think B is correct.
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Re: On most side streets in the United States, the speed limit  [#permalink]

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23 Jul 2014, 00:28
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sshrivats wrote:
D merely restates the observation that drivers who feel personally responsible drive slower .

B actually demonstrates this : B demonstrates that the drivers who feel responsible will change their behavior according to the road conditions. i.e their driving speeds depending the presence of the pedestrians.

So i think B is correct.

Hello friend,
i selected D bcause theres a causal relationship as to-

drivers less resopnsible -----) drive at higher speeds

So,when the cause is not there i.e drivers are responsible -----) drive at lower speeds ...here the effect is not there.

could u please clarify my understanding..

happy to learn...thanks
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On most side streets in the United States, the speed limit  [#permalink]

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26 Jun 2016, 12:21
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I found an explanation for this question:

The psychologists are making the following claim: that a person who FEELS PERSONALLY RESPONSIBLE will drive AT THE APPROPRIATE SPEED.

When there is no speed limit sign, each driver feels PERSONALLY RESPONSIBLE for determining the appropriate speed.
The result is that people drive at the appropriate speed.
When there is a speed limit sign, the SIGN determines the appropriate speed.
Because drivers no longer feel personally responsible for determining the appropriate speed, they drive faster.

The correct answer must strengthen the link between FEELING PERSONALLY RESPONSIBLE and DRIVING AT THE APPROPRIATE SPEED.

Drivers who feel personally responsible for operating their vehicles at speeds appropriate to the conditions of the road tend to drive faster when no pedestrians are present than they do when pedestrians are present.
The implication is that people drive more slowly when a pedestrian is present because they feel PERSONALLY RESPONSIBLE for the safety of the pedestrian.
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Re: On most side streets in the United States, the speed limit  [#permalink]

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12 Sep 2018, 10:48
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Re: On most side streets in the United States, the speed limit   [#permalink] 12 Sep 2018, 10:48
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