他们认为，那么多车混杂在一起，车的平均质量要比以前好很多，所以即使车在单程车道上抛锚，也不会再像以前那样必然导致交通堵塞了。
With so many new cars in the mix, average vehicle quality is far better than it used to be, so breakdowns on one-lane roads no longer trigger gridlock automatically, the way they once did.
很快，唐为了拿到证明文件，往科罗拉多州科特兹的银行跑了十几趟，每次都要穿过失望山谷，单程就要开两个小时车。
Before long, Don was making dozens of trips across Disappointment Valley, driving two hours each way, in order to get documents certified at the bank in Cortez, Colorado.
空回头车指如飞机和卡车的交通工具在单程中没有运输乘客或货物。
Deadhead means a vehicle, such as an aircraft and truck that transports no passengers or freight during a single trip.
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