These tiers could categorize methods of operation in conjunction with safety improvements such as separation of passenger and freight traffic and advanced train control systems.

这些安全措施包括将客运流量与货运流量隔离，升级列车控制系统等。

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Passenger vehicle one-way control, separation of the entrance and exit, benefit for reducing the pressure on the surrounding traffic.

客运车辆单向控制，出入口分离，有助降低周边交通压力。

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At last, the measures to control bicycle traffic transferring are put forward here in order to optimize the percentage of urban passenger transport.

最后提出了控制自行车交通转移的措施，以实现城市客运结构的优化。

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The FAA predicts that delays will increase 62 percent by the year 2014, given projected passenger growth and the antiquated air-traffic control system.

NPR: Holding Pattern: Flight Delays are Going Up, Up, Up

United and American control 80% of the gates at O'Hare and 89% of the passenger traffic, a cosily profitable arrangement for both.

ECONOMIST: Air travel: Relieving O’Hare | The