Abstract: Based on the traffic investigation of off-ramp joint, the lane changing characteristics are analyzed, and the rules of headway distribution are set up with statistical methods and regression techniques. It is confirmed that the possibility shift matrix technique fits the calculation of the minimum length of express off-ramp joint. Then based on headway distribution, the model of the minimum convergence section length is reformed. Finally, an example for conformation of the model is provided.

Key words: joint, off-ramp, land changing, headway

摘要： 在对下匝道衔接道路进行交通调查的基础上，应用数理统计方法和回归技术分析了衔接道路上车辆的变换车道特征和车头时距分布规律，验证了可能性转移矩阵法的假设条件是符合衔接道路的交通运行特征的，可以用该方法计算衔接道路的最小长度，并应用分析得到的衔接道路车头时距分布规律对模型进行了修正，经过算例分析验证模型的有效性

关键词: 衔接道路, 下匝道, 变换车道, 车头时距