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Congested roads are the scourge of the modern city; an increasing numbers of cars are filling our roads and they just can't cope. Yet innovators are now trying to develop cleverer vehicles, better transport networks and more environmentally friendly solutions that can help solve our transport headaches. From solar powered roads in the Netherlands to re-imagining the carbon footprint of vehicle manufacture in the U.S. Scientists and technologists around the world are increasingly looking at our transport systems and calling for change. Adam Shaw journeys on a highway to the future looking at some of the technological developments which could make our roads safer, cleaner and greener in the decades ahead.