Overall, one-quarter of journeys in Shanghai are by public transport, and the city would like to increase that to 30% by 2010.
According to Professor Chen, that will mean boosting the numbers who ride the buses as well.
Shanghai has more than 1,000 bus routes, run by a variety of private bus companies, but the system of interchanges between lines is confusing and expensive.
She has convinced the city that it should make all transfers free in order to encourage more people to ride the system.