In thirty years (1970-2000), the number of cars on the road rose from 62 million to 175 million. Road traffic accounted for approximately 80% of market share in 2000. Rail freight transport, for its part, accounted for just under 50% (45%). Every day, 10 hectares of land are covered by road infrastructure. Despite (or thanks to) this growth in infrastructure, traffic flows continue to concentrate, especially in sensitive urban areas such as the Ruhr, the Randstad, northern Italy and southern England. Growth of around 5% is expected over the next 10 years, with a doubling expected over the next 20 years.