Traffic congestion and disorderly development of land will affect the development of cities. How to make efficient use
of urban land is a major issue for cities. Based on this, the problems existing in the planning and construction of urban
rail transit in our country were analyzed. The method of rail transit network layout, as well as the site size, site selection
and spacing optimization methods were analyzed. The combinatorial network layout planning of Metro Line in a city
was studied. According to the layout of rail transit stations, a layout optimization model was proposed. Three basic network
layouts were used to lay down the subway lines in this city, and the site size, spacing and intersection points were
planned. The effective utilization rate of urban land was increased, and people's travel time was saved, so as to provide
a new idea for the layout of rail transit.
Keywords: Urban Rail Transit, Combinatorial Network, Location Optimization, Optimization of Station Spacing.
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