Green, as opposed to red, means safety; it is the color of free passage in road traffic.

绿色，与红色相反，意味着安全性；它是道路交通中自由通行的颜色。

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In another paper, Arne Kesting, of Technische Universität Dresden in Germany, and colleagues calculated that a 1% increase in the number of ACC-using vehicles would free up 0.3% of road capacity.

在另一篇论文中，德国德累斯顿技术大学的阿恩•凯斯廷及其同事计算出使用ACC的车辆增加1％将释放出0.3%的道路通行能力。

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The road is free of the tolls that burden new highways connecting urban areas.

这条路免交过路费，过路费是那些连接城市地区的新建公路的负担。

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"Obviously at night you've got a free road and young people who like to impress people' especially if they've got a lot of young people in the car as well, " he said.

BBC: NEWS | UK | Teenage driver deaths on the rise

But the intangible rewards of traveling a litter-free country road, at least until the next beer can gets tossed from a passing car window, is priceless.

WSJ: Recycled Emotions

Lorries have been given permission to use the M6 toll road for free for a month.

BBC: M6 Toll road