DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Road construction. Laying of the second course of a road. Asphalt (black) being laid on top of the aggregate sub-base (pale layer visible at bottom) of a modern road. The sub-base consists of crushed stone and concrete which is compacted by rolling. Bituminous asphalt is delivered by lorry, and is spread over the surface of the sub-base using the vehicle at left. The asphalt layer is then flattened using a roller (top right). Eventually a top wearing layer will be added to complete the road. Photographed during the construction of the Norwich southern by-pass in Norfolk, England.
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