Tunnel effects on ring road traffic flow based on an urgent-gentle class traffic model
Tunnel effects on ring road traffic flow based on an urgent-gentle class traffic model
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DOI：
10.1016/j.taml.2021.100283
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发表时间：
2021-07
影响因子：
3.4
通讯作者：
Yongliang Zhang;M. Smirnova;Jian Ma;N. Smirnov;Zuojin Zhu
中科院分区：
文献类型：
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作者：
Yongliang Zhang;M. Smirnova;Jian Ma;N. Smirnov;Zuojin Zhu
为探讨隧道对环城公路交通流的影响，提出了一个宏观的急缓交通模型。该模型将车辆分为急、缓两类，选择隧道限速作为自由流速度来表示隧道内的基本图形，采用代数表达式来描述交通压力和声速。在日本的Kobotoke隧道的两个速度轨迹，该模型进行了验证，与观测数据吻合良好。数值结果表明，在不考虑斜坡效应的情况下，隧道平均行程时间几乎为常数，并与隧道长度有关。当由堵塞密度归一化的初始密度高于约0.21的阈值时，交通冲击波在隧道入口处产生并向后传播。由于入口匝道合流效应的影响，该阈值略有下降，随着出口匝道分流效应的逐渐增强，平均行程时间逐渐下降。这些研究结果加深了对现实中隧道对交通流影响的认识。
To explore tunnel effects on ring road traffic flow, a macroscopic urgent-gentle class traffic model is put forward. The model identifies vehicles with urgent and gentle classes, chooses the tunnel speed limit as free flow speed to express the fundamental diagram in the tunnel, and adopts algebraic expressions to describe traffic pressure and sound speed. With two speed trajectories at the Kobotoke tunnel in Japan, the model is validated, with good agreement with observed data. Numerical results indicate that in the case of having no ramp effects, tunnel mean travel time is almost constant dependent on tunnel length. When initial density normalized by jam density is above a threshold of about 0.21, a traffic shock wave originates at the tunnel entrance and propagates backward. Such a threshold drops slightly as a result of on-ramp merging effect, the mean travel time drops as off-ramp diversion effect intensifies gradually. These findings deepen the understanding of tunnel effects on traffic flow in reality.