Use public transport when traveling.

旅行时使用公共交通工具。

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He says American forces often are escorted by an Iraqi convoy, even when traveling to a training site.

VOA: standard.2009.08.06

When traveling abroad, he refused the fancy lodgings that were reserved for such distinguished visitors.

在国外旅行时,他拒绝住在为贵客,准备的精致寓所中

耶鲁公开课 - 欧洲文明课程节选

Sometimes when I am traveling in America, people have a difficulty understanding me.

有时候，当我在美国旅游的时候，人们要理解我，会有一点困难。

有趣的澳大利亚英语 - SpeakingMax英语口语达人

When traveling west, he recommends taking melatonin during the second half of the night.

WSJ: To Avoid Jet Lag This Summer, Travel Like a Scientist

That goes a long way toward removing fear and caution when traveling with it.

FORBES: The Data Explosion and the Networked Enterprise

Do you have a favorite eco-friendly hotel that you stay at when traveling for work?

FORBES: 5 green hotels for business travelers