Modeling and investigating the properties of fundamental diagrams (FDs) in mixed traffic, which encompasses heterogeneous with non-lane-based flow, has been one of the emerging research areas in the past few years. The main challenges in modeling are: estimating accurate steady-state () points based on empirical observations and properly representing FDs in mixed traffic conditions. The first part of this work uses the traditional discretization approach and the optimal time–space window to apply Edie’s generalized definitions to estimate the traffic flow variables and the steady states. The second part of the work involves a trajectory shear mapping method to estimate less-scattered FDs. Finally, the shape of the FDs are determined, and their properties are studied by developing area occupancy-based () normalized flow and speed models. Empirical observations from multiple locations show that the power-law relationships seem to be the best fit based on the -based representation of the fundamental parameter that indicates the possibility of universality in the FDs from the mixed traffic conditions.

中文翻译：

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混合交通中基于区域占用的基本图的普遍性

混合交通中的基本图（FD）属性的建模和研究，包括异构和非基于车道的交通，一直是过去几年的新兴研究领域之一。建模中的主要挑战是：根据经验观察估计准确的稳态 () 点并正确表示混合交通条件下的 FD。这项工作的第一部分使用传统的离散化方法和最佳时空窗来应用 Edie 的广义定义来估计交通流变量和稳态。该工作的第二部分涉及轨迹剪切映射方法来估计较少分散的 FD。最后，确定了 FD 的形状，并通过开发基于面积占用的归一化流量和速度模型来研究其特性。来自多个地点的经验观察表明，幂律关系似乎是基于基本参数的基于 的表示的最佳拟合，该基本参数表明混合交通条件下 FD 的普遍性的可能性。