Once you are in the lane, slow gradually without causing traffic to pile up behind you.

一量驶入驶出车道，逐渐降低车速以免阻碍在后方行驶的车辆。

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The symbols show a specific lane's traffic condition: a green arrow for a lane flowing freely, a yellow arrow or yellow "X" for a slow lane, and a Red "X" for a lane that is shut down.

这些标志用于指示特定车道的交通情况：绿色箭头表示通行，黄色箭头或黄色的“X”表示慢行，而红色的“X”表示该车道禁止通行。

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She thought it was safer to stay with the slow traffic; but then she heard a voice (" not out loud, but in my mind ") telling her to get in the fast lane.

她本来认为随着缓慢的车流一起慢慢前行会比较安全，但她那时突然听到了一个声音(“不大，但却清楚地进入头脑中”)告诉她驶入快车道。

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Autonomous driving in slow traffic is a logical combination of adaptive cruise-control and the lane-keeping systems, already available in some vehicles, which either warn the driver if the car starts to drift out of lane, or apply corrective steering to keep it in lane.

ECONOMIST: Inside story