DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Road construction. Concrete road being constructed by 'road train' under a bridge. The road is laid in two halves, each half made in one pass of a series of orange machines. The first machines lay a layer of concrete half the depth of the road (at left) followed by reinforcing steel rods. Next, the top half of the road is laid with premixed concrete and consolidated. A levelling machine then moves to and fro, smoothing the surface, and applying a layer of reflective aluminium paint to control the rate at which the concrete sets (at right). The road train can lay about 300 metres of road per day. This is the A11 Wymondham bypass, England.
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