Enforcement of local speed limits through police monitoring has proven unsuccessful in the town of Ardane. In many nearby towns, speed humps (raised areas of pavement placed across residential streets,about 300 feet apart) have reduced traffic speeds on residential streets by 20 to 25 percent. In order to reduce traffic speed and thereby enhance safety in residential neighborhoods, Ardane’s transportation commission plans to install multiple speed humps in those neighborhoods.
Which of the following, if true, identifies a potentially serious drawback to the plan for installing speed humps in Ardane?


On residential streets without speed humps,many vehicles travel at speeds more than 25 percent above the posted speed limit.

Because of their high weight, emergency vehicles such as fire trucks and ambulances must slow almost to a stop at speed humps.

The residential speed limit in Ardane is higher than that of the nearby towns where speed humps were installed.

Motorists who are not familiar with the streets in Ardane’s residential districts would be likely to encounter the speed humps unawares unless warned by signs and painted indicators.

Bicyclists generally prefer that speed humps be constructed so as to leave a space on the side of the road where bicycles can travel without going over the humps.

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考题讲解

情景：A镇通过警察监督来限速的措施不太成功。在附近的镇子，安装在在居民区街道的减速带把速度减少了20-25%。为了减少速度并且提高居民社区的安全，A镇的交通部门计划在那些社区多安装几个减速带。

推理：此题为方案推理

目标：减速，保障安全。

方案：安装减速带。


选项分析：

A选项：没有减速带的居民街道，许多卡车超速25%：与方案无关。

B选项：正确。由于高重量，紧急车辆比如消防车和救护车必须在减速带前几乎停止：这里提到了方案带来的一个副作用，削弱了方案。

C选项：A镇的速度限制比附近安装了减速带的镇子的速度限制高：与方案无关。

D选项：除非被显著的标志警告，不熟悉A镇街道的司机有可能会在不知情的状态下遇到减速带：与方案无关。

E选项：骑自行车的人支持减速带，为了可以在道路边边留下可以让骑车人无减速带障碍地骑行：与方案无关。

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