In order to make the interchange overpass distance layout reasonable and save land resource, through field surveying about overpass forms, overpass distance and interchange area speed of Liaoning, and Hubei Provincial expressways, and synthetically analyzing the data, the paper uses discrete random variables which have been detected to establish maximum entropy model based on maximum entropy principle, and then construct Lagrange function; finally, get the optimal solution. Thus, the appropriate distance between interchanges have been determined and provide a theoretical basis for saving land resource.
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