The transport system affects urban quality of life in many positive ways. It aids the creation of wealth by enabling people to reach their workplace, moving raw materials and distributing finished products. Thomson identified seven interrelated components of the urban transport problem which confront municipal authorities throughout the world. Particular attention has been devoted to the problems of traffic movement and congestion, public transport, and the environmental and socio-economic impact of transport systems. The primary purpose of urban transport is to provide mobility for people and goods within a city but the efficiency with which this is achieved can be severely reduced by congestion. The pricing system adopted in Singapore is less technologically sophisticated and less flexible for experimentation but has had a significant impact on traffic flows. One way of increasing highway capacity is for transport planners to implement programmes to encourage ride-sharing through car-and van-pooling schemes.