Question 3: Many large cities or conurbations are surrounded by commuter belts, also known as metropolitan areas, ________, dormitory towns, or bedroom communities.
Question 4: Some governments and employers have introduced employee travel reduction programs that encourage such alternatives as car-pooling and ________.
Question 5: Alternatives like ________ have also been proposed to reap the energy-efficiency benefits of a mass transit system while maintaining the speed and convenience of individual transport.