Expanding population and influx of migrant workers are closely related to the problem of transportation.

人口激增与外来民工大量涌入与交通问题息息相关。

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Relief agencies say the immediate problem is not a lack of food, but transportation.

救援机构称当务之急不是食品匮乏，而是交通运输不足。

《柯林斯英汉双解大词典》

Ray LaHood, Secretary of the U.S.Department of Transportation, says distracted driving is a critical problem.

VOA: standard.2010.06.24

Richard Capka, administrator of the Federal Highway Administration, said Thursday that the agency would quickly advise transportation agencies around the country of steps they should take if a systematic problem with gusset plates was found, though he said no such advisory was yet in the works.

NPR: Officials Warn of Possible Flaw in Nation's Bridges

The complaints are regarded as indicators of a larger problem because many passengers may not realize they can file complaints with the Transportation Department, which regulates airlines.

NPR: Full Flights, Small Seats Make Passengers Grumpy

Another problem is that only a fraction of the children, whose parents can afford transportation, make it to hospitals and malnutrition centers.

BBC: Aid groups warn of Yemen 'catastrophe'