SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Motorway construction. Worker using a welding tool during construction of a new elevated section of road. The steel framework and rods will be covered in concrete. The steel framework supports the concrete, increasing the strength of the structure. This is the Zvenigorod highway crossing over the 3rd Ring Road, in Moscow, Russia. Photographed in 2005.
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