美国DOT（Department of Transportation）认证对汽车轮胎的安全性至关重要，特别是对于符合 FMVSS 109 （联邦机动车辆安全标准109）的轮胎。FMVSS 109是专门针对乘用车和轻型卡车轮胎的标准，主要确保轮胎在不同道路条件下的安全性和耐久性。

车子一多，高速公路就会堵车；飞机一多，航路同样也会发生拥堵。所以很多时候，你会遇到飞机播报已到达某城市上空，却依然需要等待很久才能落地的情况，这很可能是因为你的航班在等待航线上盘旋，排队让前面的飞机进出航路 [11] 。

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