The second biggest expense for America's top-earners is transportation, accounting for 17% of spending.

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Although PPPs are not new to America, they remain underused as an engine for transportation infrastructure investment.

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The transportation and logistics company operates in North America with trucking and intermodal services for supply chain management.

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Hands-free calling "isn't the big problem in America, " Mr. LaHood said, after a December proposal by the National Transportation Safety Board called for a complete ban on cellphone use while driving.

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