当汽车进入高速公路系统时，一只可伸缩的手臂将从汽车上落下，与轨道接触，这类似于为地铁列车供电的轨道。
When the auto enters the highway system, a retractable arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically.
现代高速公路上常设有专门的车道以供车辆离开高速公路时减速或进入高速公路时加速。
Modern freeways usually have special lanes where traffic can either slow down before exiting or speed up upon entering.
载重汽车在白天禁止通行。一到天黑，市郊高速公路上经常出现排成长队的18轮重型货车在等待进入市区。
The city also bans heavy trucks from entering the city during the day; after dark, the 18-wheelers can be seen lining up on suburban freeways, waiting for permission to enter.
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