Beijing has used license plate restrictions to limit the number of cars and set out plans to keep the oldest and most polluting vehicles off roads when air is especially bad.

北京通过车牌限制来限定汽车数量，并在空气特别糟糕的时候制定计划限制最古老和污染最严重的车辆上路。

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In carrying out highway repairs or maintenance, a time limit should be set for the job. When a highway is under repair, proper measures should be taken to ensure the free passage of vehicles.

进行公路维修应当规定修复期限。施工期间，应当采取措施，保证车辆通行。

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