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本文分析了立交平面线形设计中线形端点（起终点）受到限制的两类情况，提出其相应的设计计算方法，可用于线形的拟定、调整和优化组合，使得线形既可满足约束条件，又衔接协调，可提高设计效率和设计质量。
This paper analyzes two types of situations where the linear endpoint (starting and ending point) is limited in the design of the planar linear design of the interchange and proposes its corresponding design and calculation method, which can be used in the formulation, adjustment and optimization of the linear shape so that the linear shape can satisfy the constraints and the convergence Coordination can improve design efficiency and design quality.