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Road diet refers to a reduction in the number of travel lanes available on a road, usually by converting one or more existing travel lanes into turn lanes, bike lanes, or street parking.

“道路瘦身”是指道路上可用車道數量減少，通常是將現有的一個或多條車道變成轉彎車道、自行車道或路邊停車道。

在道路規劃方面，歐美都經驗豐富，幾年前便已引入這種理念。

The U.S. Department of Transportation (DOT) announced an 18-month campaign to improve road safety across the country. One of the things DOT plans to do is create a guide to "road diets" that it will distribute to communities and local governments.

美國交通部公布了一項歷時18個月，旨在改善全美道路安全的活動。美國交通部計劃要做的其中一件事就是制作一本“道路瘦身”指南，并將其分發給各個社區和地方政府。

DOT says that road diets can reduce traffic crashes by an average of 29 percent, and that in some smaller towns the design approach can cut crashes nearly in half.

美國交通部公布稱，道路瘦身可使平均交通事故發生量降低29%。在一些小型城市，這種設計方法可將事故數量減半。

Road diets have long been practiced in Europe and are more popular in peer cities like San Francisco and Seattle.

據悉，歐洲一直在進行道路瘦身，在洛杉磯和西雅圖等新貴城市該規劃更受歡迎。