Foto de stock - United States President Barack Obama tours the The Federal Highway Administration's Turner-Fairbank Highway Research Center July 15, 2014 in McLean, Virginia. According to the Department of Transportation, the center is home to '20 laboratories, data centers, and support facilities, and conducts applied and exploratory advanced research in vehicle-highway interaction, nanotechnology, and a host of other types of transportation research in safety, pavements, highway structures and bridges, human-centered systems, operations and intelligent transportation systems, and materials.' Credit: Chip Somodevilla / Pool via CNP /dpa - NO WIRE SERVICE - | usage worldwide. - Mclean/Virginia/United States of America

Imagen: United States President Barack Obama tours the The Federal Highway Administration's Turner-Fairbank Highway Research Center July 15, 2014 in McLean, Virginia.

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