There is almost certainly no one solution to this problem given the complexity of its causes. However, one option has to be to improve the reliability of public transport to encourage people to take the bus or the train rather than get in the car. It would also be possible to discourage people from driving to work by introducing special tariffs for using the roads, especially during peak periods. A successful example of this is the congestion charge scheme in London which has certainly reduced the level of trafficin inner-city areas.