The Four-Phase Approach to Transportation PlanningFour-Phase Approach to Transportation Planning

The four-phase approach is based on the Chicago Area Transportation Study published by the city of Chicago in 1962, marking the birth of transportation planning theory and methodology.

The Federal Highway Act of 1962 stipulates that cities with a population of 50,000 or more must develop a metropolitan area transportation plan based on a comprehensive urban transportation survey in order to receive financial subsidies for highway construction from the federal government. Get the federal government's highway construction financial subsidies. The law directly contributed to the formation and development of transportation planning theories and methods. In the beginning, traffic forecasting was only about the three stages of traffic generation, traffic distribution and traffic allocation; in the late 1960s, the traffic planning of Hiroshima metropolitan area in Japan firstly proposed the new forecasting content of dividing different transportation modes. Since then, transportation planning has become a four-step process of traffic occurrence, traffic distribution, traffic mode division and traffic distribution, which is the four-stage method (also called four-step method) theory of transportation planning. Later, people will traffic mode division and the other three steps to do different forms of combination, accordingly derived from various types of prediction methods. These are categorized into the four-stage method.