Kevin Balke, a research engineer at the Texas A&M University Transportation Institute, says that while smart lights can be particularly beneficial for some cities, others are so jammed that only a sharp reduction in the number of cars on the road will make a meaningful difference.

德克萨斯农工大学交通研究所的研究工程师凯文·鲍克说，虽然智能交通灯对一些城市特别有帮助，但有些城市太拥挤了，只有大幅减少道路上的汽车数量才能有效改变拥堵的局面。

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Research from the Virginia Tech Transportation Institute shows that motorists who text face a 23 times greater risk of crash or near crash.

佛吉尼亚理工交通学院的研究显示，那些发短信的汽车驾驶员，面临的撞车危险比其他驾驶员高23倍。

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In 2007 its congested roads cost the country 4.2 billion working hours and 10.6 billion litres of wasted petrol, according to the Texas Transportation Institute.

根据德州运输研究所的研究，2007年的道路堵塞，使得美国浪费了42亿个小时的工作时间，以及106亿公升的汽油。

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(Speaking) Institute director Eric Leonhardt says he's had his eye on the dairy herd as a source of transportation fuel for a long time.

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Instead it has a couple dozen, says Texas Transportation Institute research engineer Tim Lomax.

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The Texas Transportation Institute recently claimed they do, although their methodology has been flawed before.

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For travel delays, we used the Texas Transportation Institute's 2005 Urban Mobility Report, which compiled the annual delay per traveler for urban areas.

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