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After the national speed limit of 55 miles per hour was [#permalink]
01 Apr 2004, 08:22
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After the national speed limit of 55 miles per hour was imposed in
1974, the number of deaths per mile driven on a highway fell abruptly
as a result. Since then, however, the average speed of vehicles on
highways has risen, but the number of deaths per mile driven on a
highway has continued to fall.
Which of the following conclusions can be properly drawn from the
(A) The speed limit alone is probably not responsible for the
continued reduction in highway deaths in the years after 1974.
(B) People have been driving less since 1974.
(C) Driver-education courses have been more effective since 1974 in
teaching drivers to drive safely.
(D) In recent years highway patrols have been less effective in
catching drivers who speed.
(E) The change in the speed limit cannot be responsible for the
abrupt decline in highway deaths in 1974.