Abstract:

The macroscopic fundamental diagram (MFD) exists in large urban networks where traffic conditions are homogenous. It can be used to estimate the level of service on road networks, conduct perimeter control, and model macroscopic traffic. Different network conditions exert different effects on the shape of the MFD. The factors that influence the MFD shape should be identified, which is the premise of understanding the urban traffic laws based on the MFD. The paper takes Haizhu District network of Guangzhou, China for the analysis using Paramics. A microscopic simulation is conducted to derive MFDs under different management conditions. Results indicate that the MFD shape is a property not only of the network itself but also of the applied traffic control measures, which is able to reflect the police effects. Meanwhile, the dramatic changes in traffic demand, the setting of bus lane, and the lane forbidden all have certain impacts on the MFD shape. Additionally, the critical sections should be given priority when developing the traffic control strategy.

Key words: intelligent transportation, MFD impacts analysis, Paramics simulation model, urban network, traffic management

摘要：

宏观基本图（MFD）存在于具有交通运行同质性的城市路网中，它可以用于路网的服务水平评估、区域控制和宏观交通建模.不同道路运行条件对MFD的形状存在不同的影响，进行MFD影响因素分析是应用MFD理论研究城市交通运行规律的前提.本文以广州市海珠区为研究区域，运用Paramics交通仿真软件对海珠区的路网进行建模，通过采取不同交通管控措施，分析MFD图形的影响因素.结果表明，MFD不仅是路网本身的性质，也是控制策略效果好坏的直接体现.同时，需求的剧烈变化、公交专用道的设置、车道禁行都会不同程度的影响路网的MFD.另外，制定交通控制策略时要优先考虑路网中的关键路段.

关键词: 智能交通, 宏观基本图影响分析, Paramics交通仿真, 城市路网, 交通管理