The key to optimization of transportation networks within metropolis areas is to satisfy what is known as the one-hour's law. Based on the analysis of OD (origin-destination) surveys and mobile data from Shanghai, the spatial scale of the commuting circle was analyzed and has increased from a radius of 15 km to 30 km, as determined by the travel time data. The theoretical commuting range calculated using the rail transit and arterial road networks were compared and calibrated using realistic commuting range data obtained from a travel demand distribution. With the identification of employment centers and high-volume passenger corridors, the spatial scale and layout of commuting circles for the Shanghai metropolis area are estimated and established. The overall commuting range based on transit level of service as well as road network structure is identified and compared to the one-hour standard.
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