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。
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.
您可以通过点击货运重叠或经济，然后乘客覆盖了客运和货运流量在您的城市。
You can get an overlay of the passenger and freight flow in your city by clicking on the economic overlay, then passengers or freight.
申请加入欧盟的国家预计将出现强劲的经济增长，这将导致交通运输流量增加，特别是公路货运量。
The strong economic growth expected in countries which are candidates for entry to the EU will also increase transport flows, in particular road haulage traffic.
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