He hiked a few hundred yards to a road and flagged down workers with the Colorado Department of Transportation, Sheriff Don Kruger said.

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The U.S. Department of Transportation today is launching an important road test involving 3, 000 vehicles in and around Ann Arbor, Mich.

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What that means is the road builders want spending determined by various assessments from the Department of Transportation and others of what's needed to maintain and improve the transportation infrastructure in the U.S. If receipts coming into the Highway Trust Fund fall short of those needs, the lobby argues Congress should close the gap.

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Carmakers are also working with the U.S. Department of Transportation, which is testing applications through which vehicles would communicate with signals and road signs.

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