题目选项分析

The heavy traffic in Masana is a growing drain on the city's economy--the clogging of the streets of the central business district alone cost the economy more than $1.2 billion over the past year. In order to address this problem, officials plan to introduce congestion pricing, by which drivers would pay to enter the city`s most heavily trafficked areas during the busiest times of the day.

Which of the following, if true, would most strongly indicate that the plan will be a success?

【选项】Approximately one-fifth of the vehicles in the central business district are in transit from one side of the city to the other.