ABSTRACT
Currently, roads are often congested, which is expensive in terms of delays to the movement of people and freight. It is commonly suggested that building more roads, or widening existing ones, would ease the traffic jams. But not only is the cost of such work high, but the construction process adds to the congestion, while the resulting extra road space may encourage extra traffic. Therefore, constructing more roads is unlikely to solve the problem, and other remedies, such as road pricing or greater use of public transport, should be examined.
